New materials for quantum technology, how ultrasound can help detect breast cancer
In this episode of the Physics World Weekly podcast, we explore how computational physics is being used to develop new quantum materials; and we look at how ultrasound can help detect breast cancer.
Our first guest is Bhaskaran Muralidharan, who leads the Computational Nanoelectronics & Quantum Transport Group at the Indian Institute of Technology Bombay. In a conversation with Physics World’s Hamish Johnston, he explains how computational physics is being used to develop new materials and devices for quantum science and technology. He also shares his personal perspective on quantum physics in this International Year of Quantum Science and Technology.
Our second guest is Daniel Sarno of the UK’s National Physical Laboratory, who is an expert in the medical uses of ultrasound. In a conversation with Physics World’s Tami Freeman, Sarno explains why conventional mammography can struggle to detect cancer in patients with higher density breast tissue. This is a particular problem because women with such tissue are at higher risk of developing the disease. To address this problem, Sarno and colleagues have developed a ultrasound technique for measuring tissue density and are commercializing it via a company called sona.
- Bhaskaran Muralidharan is an editorial board member on Materials for Quantum Technology. The journal is produced by IOP Publishing, which also brings you Physics World
This article forms part of Physics World‘s contribution to the 2025 International Year of Quantum Science and Technology (IYQ), which aims to raise global awareness of quantum physics and its applications.
Stayed tuned to Physics World and our international partners throughout the next 12 months for more coverage of the IYQ.
Find out more on our quantum channel.
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1 00:00:09,359 --> 00:00:12,320 Hello, and welcome to the Physics World Weekly 2 00:00:12,320 --> 00:00:14,259 podcast. I'm Hamish Johnston. 3 00:00:15,074 --> 00:00:17,495 Coming up in this episode, we meet Daniel 4 00:00:17,554 --> 00:00:18,054 Sarno, 5 00:00:18,434 --> 00:00:19,495 who is a cofounder 6 00:00:19,954 --> 00:00:22,774 and chief technology officer of Sona. 7 00:00:23,635 --> 00:00:24,774 Based at The UK's 8 00:00:25,154 --> 00:00:26,774 National Physical Laboratory, 9 00:00:27,460 --> 00:00:30,919 Sona is developing a new method for determining 10 00:00:31,140 --> 00:00:32,600 breast tissue density 11 00:00:33,219 --> 00:00:34,280 using ultrasound 12 00:00:34,820 --> 00:00:37,719 rather than conventional x-ray based mammography. 13 00:00:38,739 --> 00:00:39,799 Sarno explains 14 00:00:40,179 --> 00:00:41,799 how this can help improve 15 00:00:42,344 --> 00:00:43,484 the early detection 16 00:00:43,864 --> 00:00:45,085 of breast cancer. 17 00:00:45,864 --> 00:00:47,884 But first, I'm in conversation 18 00:00:48,504 --> 00:00:49,484 with Bhaskaran 19 00:00:50,104 --> 00:00:51,405 Muraleed Haran, 20 00:00:51,945 --> 00:00:55,004 who is at the Indian Institute of Technology, 21 00:00:55,545 --> 00:00:56,045 Bombay. 22 00:00:57,090 --> 00:00:59,909 An engineer by training, he has a keen 23 00:01:00,049 --> 00:01:03,890 interest in using computational physics to develop new 24 00:01:03,890 --> 00:01:05,270 materials and devices 25 00:01:05,650 --> 00:01:07,670 for quantum science and technology. 26 00:01:08,609 --> 00:01:09,989 I began the interview 27 00:01:10,444 --> 00:01:13,504 by asking about how computational science 28 00:01:13,805 --> 00:01:15,344 is being used to create 29 00:01:15,805 --> 00:01:17,185 new quantum materials. 30 00:01:26,409 --> 00:01:26,909 So 31 00:01:27,290 --> 00:01:30,090 in order to so the next generation of 32 00:01:30,090 --> 00:01:31,150 quantum technologies 33 00:01:32,170 --> 00:01:32,990 will feature 34 00:01:33,689 --> 00:01:36,170 what is called quantum hardware. And the quantum 35 00:01:36,170 --> 00:01:38,350 hardware is obviously devices. 36 00:01:39,314 --> 00:01:41,414 And just like you have the 37 00:01:42,034 --> 00:01:44,994 complementary MOS or the CMOS being the building 38 00:01:44,994 --> 00:01:46,774 block of the digital technology, 39 00:01:47,474 --> 00:01:50,515 you will have building blocks based on quantum 40 00:01:50,515 --> 00:01:52,054 devices for the next 41 00:01:52,409 --> 00:01:54,829 generation or the upcoming quantum technologies. 42 00:01:55,450 --> 00:01:59,469 For example, the, superconducting qubit, that's a device. 43 00:01:59,609 --> 00:02:00,109 So 44 00:02:00,810 --> 00:02:02,670 just like in the CMOS era, 45 00:02:03,450 --> 00:02:03,950 the 46 00:02:04,805 --> 00:02:07,444 the industry relied on device modeling as an 47 00:02:07,444 --> 00:02:10,564 important aspect of, you know, giving feedback to 48 00:02:10,564 --> 00:02:11,064 experiments. 49 00:02:11,444 --> 00:02:13,544 So there's whole there's this whole thing about 50 00:02:13,844 --> 00:02:16,805 a feedback between theory and experiment and and 51 00:02:16,805 --> 00:02:19,205 as to achieve a synergy between theory and 52 00:02:19,205 --> 00:02:19,705 experiment. 53 00:02:20,290 --> 00:02:21,830 So that first experiment 54 00:02:22,210 --> 00:02:23,990 is understood via theory 55 00:02:24,370 --> 00:02:27,010 and then the theory can probably predict something 56 00:02:27,010 --> 00:02:29,490 new. And the experiment can go toward that 57 00:02:29,490 --> 00:02:31,430 step and back and forth and, 58 00:02:31,730 --> 00:02:33,349 you know, that's how things develop. 59 00:02:34,004 --> 00:02:36,485 Another thing is theory is also useful in 60 00:02:36,485 --> 00:02:36,985 giving 61 00:02:37,365 --> 00:02:38,344 inputs about 62 00:02:38,805 --> 00:02:41,444 possibly new materials that can achieve the same 63 00:02:41,444 --> 00:02:41,944 functionality. 64 00:02:42,724 --> 00:02:43,865 One great example 65 00:02:44,485 --> 00:02:45,705 is just before 66 00:02:46,200 --> 00:02:48,460 we are in what is called the Beyond 67 00:02:48,520 --> 00:02:52,120 Moore era, where devices are shrinking toward the 68 00:02:52,120 --> 00:02:52,620 limits 69 00:02:53,319 --> 00:02:55,659 and people are looking at alternate technologies. 70 00:02:56,520 --> 00:02:57,500 One of the technologies 71 00:02:57,800 --> 00:02:59,639 just before all this quantum, 72 00:03:00,605 --> 00:03:02,385 revolution started was Spintronics. 73 00:03:03,165 --> 00:03:05,025 Spintronics is the technology 74 00:03:05,405 --> 00:03:06,064 or the 75 00:03:06,444 --> 00:03:09,185 or what's called the paradigm which tries to 76 00:03:09,564 --> 00:03:11,824 use spins or the electron spins 77 00:03:12,444 --> 00:03:13,985 as a medium of information. 78 00:03:14,509 --> 00:03:16,590 Just like you have the charge, which is 79 00:03:16,590 --> 00:03:18,609 basically the charge of the electron, 80 00:03:19,069 --> 00:03:21,229 you also each electron comes with a spin. 81 00:03:21,229 --> 00:03:22,909 And in high school, you would have studied 82 00:03:22,909 --> 00:03:25,150 up spin and down spin. That can be 83 00:03:25,150 --> 00:03:26,209 units of information. 84 00:03:26,895 --> 00:03:28,514 So one of the things computation 85 00:03:28,814 --> 00:03:31,375 did is that they predicted a new material 86 00:03:31,375 --> 00:03:32,754 called magnesium oxide, 87 00:03:33,294 --> 00:03:36,835 which can produce a better spintronic device. And 88 00:03:37,135 --> 00:03:40,435 lo and behold, that tech the magnesium oxide 89 00:03:40,495 --> 00:03:40,995 based, 90 00:03:41,769 --> 00:03:45,549 Spintronic devices are getting close to, you know, 91 00:03:45,930 --> 00:03:47,930 being in the market or something like that. 92 00:03:47,930 --> 00:03:50,590 This is an example where theory can predict 93 00:03:50,650 --> 00:03:51,629 a new functionality 94 00:03:52,330 --> 00:03:54,830 and eventually lead to new developments. 95 00:03:55,575 --> 00:03:57,594 The same goes with probably 96 00:03:58,694 --> 00:04:01,275 several nice ideas can come from theory. 97 00:04:01,735 --> 00:04:02,715 And computational 98 00:04:04,215 --> 00:04:05,355 is the computational 99 00:04:05,814 --> 00:04:08,534 modeling is the next step. Theory is more 100 00:04:08,534 --> 00:04:10,819 like at the level where you can come 101 00:04:10,819 --> 00:04:13,159 up with neat ideas from physics. 102 00:04:13,699 --> 00:04:16,740 Then comes the actual computational modeling where you 103 00:04:16,740 --> 00:04:20,600 try to simulate possibly the actual device situation. 104 00:04:21,300 --> 00:04:23,295 And that is more hands on towards 105 00:04:23,855 --> 00:04:27,555 talking to experimentalists or talking towards technology, etcetera. 106 00:04:28,335 --> 00:04:30,375 So another example is back in the ninety's 107 00:04:30,574 --> 00:04:32,895 sorry, back in the early two thousand's, people 108 00:04:32,895 --> 00:04:35,694 were trying out carbon nanotube transistors as a 109 00:04:35,694 --> 00:04:38,319 possible next generation. And that's when a lot 110 00:04:38,319 --> 00:04:39,740 of theorists were working 111 00:04:40,199 --> 00:04:42,860 at the level of understanding how carbon nanotubes 112 00:04:42,920 --> 00:04:45,960 can behave like transistors, etc. Today, there's a 113 00:04:45,960 --> 00:04:48,279 lot of computational theory which working on two 114 00:04:48,279 --> 00:04:48,939 d materials. 115 00:04:49,800 --> 00:04:50,620 And especially 116 00:04:51,080 --> 00:04:51,580 toward 117 00:04:52,324 --> 00:04:53,944 transistor technologies, etcetera, 118 00:04:54,245 --> 00:04:56,905 on molybdenum disulfide and various other materials. 119 00:04:57,525 --> 00:04:59,605 The same way I could say that theory 120 00:04:59,605 --> 00:05:00,745 and modeling helps 121 00:05:01,125 --> 00:05:03,525 in many ways. One is, of course, there's 122 00:05:03,525 --> 00:05:05,705 a lot of work on superconducting qubits. 123 00:05:06,199 --> 00:05:07,740 And then from the superconducting 124 00:05:08,040 --> 00:05:09,899 qubits, you need to achieve 125 00:05:10,279 --> 00:05:10,779 communications 126 00:05:11,160 --> 00:05:12,300 between these qubits. 127 00:05:12,600 --> 00:05:14,839 So there's a lot of theory and modeling 128 00:05:14,839 --> 00:05:17,399 at that level where you can understand and 129 00:05:17,399 --> 00:05:18,584 go towards the 130 00:05:19,144 --> 00:05:21,384 various layers that are involved in the quantum 131 00:05:21,384 --> 00:05:21,884 technology. 132 00:05:22,264 --> 00:05:23,944 You have the building block that is a 133 00:05:23,944 --> 00:05:24,444 qubit. 134 00:05:25,144 --> 00:05:27,485 Just like the transistor was a building block. 135 00:05:27,544 --> 00:05:29,724 Then you have, you put them into circuits 136 00:05:30,024 --> 00:05:32,240 and then you make them into a processor. 137 00:05:32,860 --> 00:05:34,860 The same way we are hoping that quantum 138 00:05:34,860 --> 00:05:37,120 technology will reach a processor level. 139 00:05:37,500 --> 00:05:39,259 And at that level, you have a lot 140 00:05:39,259 --> 00:05:42,139 of scope for computational engineers to sort of 141 00:05:42,139 --> 00:05:44,220 help and improve the designs and things like 142 00:05:44,220 --> 00:05:44,720 that. 143 00:05:45,034 --> 00:05:46,794 So can you talk a bit about some 144 00:05:46,794 --> 00:05:48,735 of the materials that you're investigating 145 00:05:49,194 --> 00:05:51,134 at the moment? What are the hot materials 146 00:05:51,194 --> 00:05:51,935 at the moment 147 00:05:52,394 --> 00:05:52,714 for, 148 00:05:53,354 --> 00:05:57,354 quantum Yeah. Technologies? Yep. So when we talk 149 00:05:57,354 --> 00:05:58,574 about quantum technologies, 150 00:05:59,300 --> 00:06:01,539 the first building block is a qubit or 151 00:06:01,539 --> 00:06:02,599 the quantum bit. 152 00:06:02,979 --> 00:06:05,539 And to realize quantum bit already or the 153 00:06:05,539 --> 00:06:07,879 qubit, there are already many platforms. 154 00:06:08,819 --> 00:06:11,139 I would just trace back to 1926 155 00:06:11,139 --> 00:06:11,959 for a second. 156 00:06:12,339 --> 00:06:13,560 At that point of time, 157 00:06:13,915 --> 00:06:16,975 they predicted that a device called the MOSFET 158 00:06:17,115 --> 00:06:18,975 or what's called metal oxide semiconductor 159 00:06:19,915 --> 00:06:21,295 field effect is possible. 160 00:06:21,754 --> 00:06:23,615 But no one took that for serious, 161 00:06:24,714 --> 00:06:26,370 no one took that to serious notice. 162 00:06:26,850 --> 00:06:29,569 And the bipolar junction transistor was invented in 163 00:06:29,569 --> 00:06:31,589 somewhere around 1949. 164 00:06:31,970 --> 00:06:34,449 And the inventors were back then asked, what 165 00:06:34,449 --> 00:06:35,350 is the application? 166 00:06:35,729 --> 00:06:37,589 Bardeen, Bertain and Shockley. 167 00:06:38,370 --> 00:06:40,884 John Bardeen just came up and said, probably 168 00:06:40,884 --> 00:06:42,805 it's a good amplifier. It can be used 169 00:06:42,805 --> 00:06:43,944 as a hearing aid. 170 00:06:44,324 --> 00:06:46,404 Now you can believe it. The transistor changed 171 00:06:46,404 --> 00:06:47,064 the world. 172 00:06:47,444 --> 00:06:50,004 And I think in nineteen fifties, someone took 173 00:06:50,004 --> 00:06:51,544 up the field effect transistor 174 00:06:52,084 --> 00:06:54,245 and then rest is history. Whatever the patent 175 00:06:54,245 --> 00:06:55,800 was filed in 1924, 176 00:06:56,120 --> 00:06:58,439 in nineteen fifties it came up. So here's 177 00:06:58,439 --> 00:06:59,099 the deal. 178 00:06:59,399 --> 00:07:00,379 Lots of competing 179 00:07:01,000 --> 00:07:04,680 technologies or paradigms exist much before the real 180 00:07:04,680 --> 00:07:06,060 one takes on and becomes 181 00:07:06,519 --> 00:07:09,794 the true, you know, life changing technology. So 182 00:07:09,794 --> 00:07:12,194 at this stage, at the nascent stage, we 183 00:07:12,194 --> 00:07:14,914 have several candidates for the qubits. One is 184 00:07:14,914 --> 00:07:15,574 a superconducting 185 00:07:15,875 --> 00:07:17,814 qubit which is reasonably mature. 186 00:07:18,274 --> 00:07:19,654 We are looking into superconducting 187 00:07:20,035 --> 00:07:22,454 hybrid systems for that purpose to understand 188 00:07:23,149 --> 00:07:26,289 the inner workings of the superconducting qubit device. 189 00:07:27,229 --> 00:07:30,050 And at more exploratory levels or not 190 00:07:30,750 --> 00:07:32,909 not so much nascent, but somewhere in between 191 00:07:32,909 --> 00:07:34,289 we have the silicon qubits 192 00:07:34,909 --> 00:07:38,084 and donor qubits and various types of materials 193 00:07:38,225 --> 00:07:39,764 that are surrounding the silicon. 194 00:07:40,544 --> 00:07:43,524 The ambition is to integrate silicon into cubits. 195 00:07:43,665 --> 00:07:46,884 And so silicon cubits are also quite actively 196 00:07:47,104 --> 00:07:49,425 investigated and we are also doing a lot 197 00:07:49,425 --> 00:07:50,485 of work on understanding 198 00:07:51,199 --> 00:07:52,500 the devices that 199 00:07:52,800 --> 00:07:53,860 make these qubits. 200 00:07:54,639 --> 00:07:57,540 The third one is for other quantum technologies. 201 00:07:58,080 --> 00:08:01,300 Those are technologies that are not just necessarily 202 00:08:01,360 --> 00:08:02,339 qubits but 203 00:08:02,639 --> 00:08:05,220 maybe for single photon detection 204 00:08:05,915 --> 00:08:07,935 or surrounding various other 205 00:08:08,475 --> 00:08:08,975 applications 206 00:08:09,514 --> 00:08:11,454 that come under the quantum umbrella. 207 00:08:11,995 --> 00:08:14,634 You have a lot of materials like tungsten 208 00:08:14,634 --> 00:08:16,814 telluride. So a lot of two d materials 209 00:08:17,035 --> 00:08:18,735 are under a lot of investigation 210 00:08:19,449 --> 00:08:20,589 for various applications 211 00:08:20,889 --> 00:08:23,129 surrounding this whole quantum technology, which we are 212 00:08:23,129 --> 00:08:26,350 also actively looking at. For instance, tungsten telluride 213 00:08:26,810 --> 00:08:28,730 is a material that is known to be 214 00:08:28,730 --> 00:08:30,750 something called a topological insulator. 215 00:08:31,210 --> 00:08:34,429 Now a topological insulator is an interesting material 216 00:08:35,084 --> 00:08:35,824 that sort 217 00:08:36,365 --> 00:08:36,944 of conducts 218 00:08:37,404 --> 00:08:40,365 what is called very pristine edge states that 219 00:08:40,365 --> 00:08:41,084 are not 220 00:08:41,644 --> 00:08:42,784 or that are 221 00:08:43,245 --> 00:08:44,464 that do not have 222 00:08:44,845 --> 00:08:47,024 what you call traditional words dissipation. 223 00:08:47,820 --> 00:08:50,379 Now dissipation is like think about cars in 224 00:08:50,379 --> 00:08:52,300 a traffic and a lot of people around. 225 00:08:52,300 --> 00:08:54,000 Your car cannot go smoothly. 226 00:08:54,379 --> 00:08:55,600 But these are materials 227 00:08:56,139 --> 00:08:58,300 that can go in such an environment, but 228 00:08:58,300 --> 00:09:00,460 on the edges, they conduct so well that 229 00:09:00,460 --> 00:09:02,240 it's almost like edges of freeways 230 00:09:02,694 --> 00:09:03,514 where you go 231 00:09:04,375 --> 00:09:06,615 without scattering with anyone. But the bulk of 232 00:09:06,615 --> 00:09:09,674 the material is like a crowded road. 233 00:09:10,134 --> 00:09:12,855 So this kind of a new material gives 234 00:09:12,855 --> 00:09:15,894 you very interesting properties which can be used 235 00:09:15,894 --> 00:09:17,754 for various quantum applications. 236 00:09:18,379 --> 00:09:20,720 It can also be used for classical applications. 237 00:09:20,860 --> 00:09:23,179 So these are the classes of materials we 238 00:09:23,179 --> 00:09:25,179 look at. And the word is a nice 239 00:09:25,179 --> 00:09:27,440 word for these. It's called quantum materials. 240 00:09:28,299 --> 00:09:30,379 Now you might ask every material could be 241 00:09:30,379 --> 00:09:31,815 quantum. The answer is 242 00:09:32,455 --> 00:09:33,514 it's not like that. 243 00:09:34,375 --> 00:09:36,634 Quantum materials are special because 244 00:09:37,095 --> 00:09:39,174 you can see their if I can we 245 00:09:39,174 --> 00:09:40,634 finally use the word, quantumness 246 00:09:41,575 --> 00:09:44,455 at longer length scales. For instance, when you 247 00:09:44,455 --> 00:09:47,829 measure the resistance of a topological material, it 248 00:09:47,829 --> 00:09:49,449 will show you something that's quantized 249 00:09:50,149 --> 00:09:50,649 at 250 00:09:51,190 --> 00:09:53,589 there's a standard number for that. But yeah. 251 00:09:53,589 --> 00:09:55,529 So it will show you a quantized resistance 252 00:09:56,070 --> 00:09:58,490 and things like that. So these are materials 253 00:09:58,870 --> 00:10:01,350 that can be used for various surrounding quantum 254 00:10:01,350 --> 00:10:01,850 technologies 255 00:10:02,845 --> 00:10:03,665 That include, 256 00:10:04,524 --> 00:10:05,585 photon detection 257 00:10:07,325 --> 00:10:08,065 and materials. 258 00:10:08,445 --> 00:10:11,904 They could be also what's called peripheral technologies, 259 00:10:12,205 --> 00:10:15,600 the qubit technologies and various things like that. 260 00:10:15,839 --> 00:10:18,240 So we are at an exciting phase and 261 00:10:18,240 --> 00:10:20,240 world is changing rapidly. There are lots of 262 00:10:20,240 --> 00:10:21,459 materials to investigate. 263 00:10:21,839 --> 00:10:24,159 And every day there's a new breakthrough and 264 00:10:24,159 --> 00:10:26,000 we hope to sort of ride the wave 265 00:10:26,000 --> 00:10:28,319 with our research. Right. And and and what 266 00:10:28,319 --> 00:10:30,500 about at the at the device level? 267 00:10:30,914 --> 00:10:33,075 What what what sort of devices are you 268 00:10:33,075 --> 00:10:35,095 are you interested in studying 269 00:10:35,475 --> 00:10:37,394 from a computational point of view at the 270 00:10:37,394 --> 00:10:37,894 moment? 271 00:10:38,355 --> 00:10:39,414 Yes. Thank you. 272 00:10:39,875 --> 00:10:42,774 So the devices I work on are specifically 273 00:10:43,714 --> 00:10:46,320 related to two things. One is the qubits 274 00:10:46,320 --> 00:10:47,460 stem cells. How 275 00:10:47,840 --> 00:10:50,340 how to make better qubits with the existing 276 00:10:50,480 --> 00:10:52,320 devices. So in that sense, we look at 277 00:10:52,320 --> 00:10:54,100 what is called quantum dot devices. 278 00:10:55,039 --> 00:10:57,279 These devices can host what is called, for 279 00:10:57,279 --> 00:11:00,580 instance, silicon qubits or spin qubits. 280 00:11:00,975 --> 00:11:02,815 These are one type of qubit. As I 281 00:11:02,815 --> 00:11:04,514 said, there are many competing qubit 282 00:11:04,975 --> 00:11:06,894 technologies. The other devices we look at are 283 00:11:06,894 --> 00:11:09,774 superconducting hybrid systems as I said. One of 284 00:11:09,774 --> 00:11:11,934 which is a reasonably mature technology, it's called 285 00:11:11,934 --> 00:11:14,834 the transmon qubit, which is based on superconductors. 286 00:11:15,480 --> 00:11:17,820 There are other qubits that are also being 287 00:11:17,879 --> 00:11:18,779 currently investigated. 288 00:11:19,720 --> 00:11:23,240 And there are many advantages slash disadvantages at 289 00:11:23,240 --> 00:11:24,779 at the level of each platform. 290 00:11:25,320 --> 00:11:27,159 So one of the things that would come 291 00:11:27,159 --> 00:11:29,325 up next is a hybrid quantum system that 292 00:11:29,325 --> 00:11:31,665 could actually leverage the advantages of various 293 00:11:32,205 --> 00:11:33,825 types of, systems, 294 00:11:34,365 --> 00:11:36,764 bring them together for a quantum processing. So 295 00:11:36,764 --> 00:11:38,285 in that sense, we are looking at two 296 00:11:38,285 --> 00:11:39,825 d materials for qubits. 297 00:11:40,205 --> 00:11:42,700 We are looking at spin qubits at silicon 298 00:11:42,700 --> 00:11:45,100 level. We are also looking at superconducting hybrid 299 00:11:45,100 --> 00:11:45,600 systems 300 00:11:46,139 --> 00:11:48,540 at a broad level for various other competing 301 00:11:48,540 --> 00:11:49,440 qubit paradigms. 302 00:11:50,220 --> 00:11:53,180 Yeah. I see. And one of the, 303 00:11:54,164 --> 00:11:55,464 sort of early applications, 304 00:11:55,764 --> 00:11:57,945 I suppose, of quantum computers 305 00:11:58,565 --> 00:11:59,625 is doing 306 00:12:00,084 --> 00:12:00,584 simulations 307 00:12:01,365 --> 00:12:02,184 of materials 308 00:12:02,644 --> 00:12:05,945 because, of course, materials are quantum in nature. 309 00:12:06,269 --> 00:12:09,550 And it it in some cases, it's easier 310 00:12:09,550 --> 00:12:11,810 to do the simulation on a quantum computer, 311 00:12:12,029 --> 00:12:14,269 if you had one, than it would be 312 00:12:14,269 --> 00:12:16,750 on a classical computer. Is that something that 313 00:12:16,750 --> 00:12:17,889 you're you're actively 314 00:12:18,670 --> 00:12:21,090 looking at at the moment, actually using 315 00:12:21,654 --> 00:12:24,855 nascent quantum computers to do some of your 316 00:12:24,855 --> 00:12:27,495 computational work? Or is that is that something 317 00:12:27,495 --> 00:12:28,634 from for the future, 318 00:12:29,414 --> 00:12:31,035 with regards to your research? 319 00:12:31,815 --> 00:12:33,894 Yes. So thank you for this question. So 320 00:12:33,894 --> 00:12:34,715 there are many, 321 00:12:35,414 --> 00:12:37,570 let's say there are many aspects to your 322 00:12:37,570 --> 00:12:40,289 question. The first part was more to do 323 00:12:40,289 --> 00:12:43,490 with simulating materials. Right? So that is often 324 00:12:43,490 --> 00:12:46,610 called quantum simulations. That's a word for it. 325 00:12:46,610 --> 00:12:48,470 So you can simulate a hypothetical 326 00:12:49,250 --> 00:12:49,750 material. 327 00:12:50,315 --> 00:12:52,394 For instance, there is there was there were 328 00:12:52,394 --> 00:12:53,934 some materials that people 329 00:12:54,475 --> 00:12:56,954 predicted in theory that really don't come as 330 00:12:56,954 --> 00:12:57,534 a material. 331 00:12:57,914 --> 00:12:59,914 For instance, there's something called the Kita f 332 00:12:59,914 --> 00:13:02,235 chain, which is supposed to have what's called 333 00:13:02,235 --> 00:13:03,534 a p wave superconductivity. 334 00:13:04,235 --> 00:13:05,534 Doesn't exist in nature. 335 00:13:05,899 --> 00:13:08,379 Right? There's another chain called some of these 336 00:13:08,379 --> 00:13:10,940 materials they are they have something called SSI 337 00:13:10,940 --> 00:13:13,740 chain. Many of these materials don't exist in 338 00:13:13,740 --> 00:13:17,120 nature. But you can simulate them using quantum, 339 00:13:17,884 --> 00:13:18,865 for instance, quantum 340 00:13:19,245 --> 00:13:21,325 computer. Not just a quantum computer but you 341 00:13:21,325 --> 00:13:24,284 can simulate them by aligning materials in a 342 00:13:24,284 --> 00:13:24,784 row 343 00:13:25,164 --> 00:13:27,725 trying to achieve that Hamiltonian. That is called 344 00:13:27,725 --> 00:13:28,784 a quantum simulation. 345 00:13:29,325 --> 00:13:31,589 However, if you're asking about how we use 346 00:13:31,589 --> 00:13:34,089 the quantum computer to do some of our 347 00:13:34,309 --> 00:13:36,649 device simulations, the answer is no yet. 348 00:13:37,029 --> 00:13:39,690 We do not we do not yet simulate 349 00:13:39,750 --> 00:13:42,549 these things. And there are quantum computers I 350 00:13:42,549 --> 00:13:45,285 know. And probably you can fire simulations 351 00:13:45,985 --> 00:13:47,764 using Qiskit and other softwares. 352 00:13:48,144 --> 00:13:50,225 But those are more about trying out certain 353 00:13:50,225 --> 00:13:51,125 quantum algorithms. 354 00:13:51,985 --> 00:13:54,065 And some people can, you know, run a 355 00:13:54,065 --> 00:13:55,379 search algorithm or 356 00:13:55,779 --> 00:13:58,019 one of these famous six algorithms are there, 357 00:13:58,019 --> 00:13:59,080 four or five algorithms. 358 00:13:59,620 --> 00:14:01,860 You could try out those algorithms on quantum 359 00:14:01,860 --> 00:14:04,100 computers. That's what at the back end. So 360 00:14:04,100 --> 00:14:05,879 that's probably what I think 361 00:14:06,259 --> 00:14:07,000 is there 362 00:14:07,379 --> 00:14:08,519 out is out there. 363 00:14:08,865 --> 00:14:11,105 I'm not sure if we have done anything 364 00:14:11,105 --> 00:14:13,424 on those fronts because we directly simulate the 365 00:14:13,424 --> 00:14:14,725 physics of the devices. 366 00:14:15,184 --> 00:14:16,085 So for instance, 367 00:14:16,784 --> 00:14:18,865 the main let's say I would call the 368 00:14:18,865 --> 00:14:21,445 protagonist of all these stories is the electrons 369 00:14:21,504 --> 00:14:24,329 for us. Electrons are the subatomic particles that 370 00:14:24,329 --> 00:14:26,649 carry electric current. Right? The reason you have 371 00:14:26,649 --> 00:14:28,329 electricity is electrons. The reason you have a 372 00:14:28,329 --> 00:14:29,870 computer eventually is electrons. 373 00:14:30,570 --> 00:14:33,450 And, so the quantum devices some of the 374 00:14:33,450 --> 00:14:36,029 quantum devices that could form quantum computers 375 00:14:36,394 --> 00:14:38,894 or what's called solid state quantum computers 376 00:14:39,514 --> 00:14:40,014 would 377 00:14:40,475 --> 00:14:43,455 depend on electrons. So we simulate and understand 378 00:14:43,674 --> 00:14:44,174 electron 379 00:14:44,955 --> 00:14:48,095 motion or electron transport across these devices. 380 00:14:48,554 --> 00:14:49,534 And that's precisely 381 00:14:50,120 --> 00:14:52,459 what we use mathematical models to simulate. 382 00:14:53,079 --> 00:14:55,480 And that at that level, we probably don't 383 00:14:55,480 --> 00:14:56,779 need a quantum computer 384 00:14:57,480 --> 00:14:59,879 to understand or speed up our algorithms. We'd 385 00:14:59,879 --> 00:15:02,759 rather use standard GPU type, you know, speed 386 00:15:02,759 --> 00:15:05,304 ups, which are good enough. Yeah. 387 00:15:05,684 --> 00:15:09,144 I see. Okay. And and this year, 2025, 388 00:15:09,204 --> 00:15:10,264 is the international 389 00:15:10,644 --> 00:15:11,144 year 390 00:15:11,524 --> 00:15:12,264 of quantum. 391 00:15:12,964 --> 00:15:14,345 And what we're doing here 392 00:15:14,725 --> 00:15:16,964 at Physics World is we're asking as many 393 00:15:16,964 --> 00:15:18,584 physicists as we can, 394 00:15:19,409 --> 00:15:20,309 one question. 395 00:15:21,490 --> 00:15:22,950 And that question is, 396 00:15:23,330 --> 00:15:25,830 what does quantum physics mean to you? 397 00:15:28,210 --> 00:15:28,710 Well, 398 00:15:29,090 --> 00:15:29,990 I have been 399 00:15:31,250 --> 00:15:32,309 studying quantum 400 00:15:33,009 --> 00:15:33,669 in devices 401 00:15:34,315 --> 00:15:35,774 since 02/2003. 402 00:15:36,235 --> 00:15:37,934 So much before the quantum, 403 00:15:39,355 --> 00:15:39,855 technology 404 00:15:41,195 --> 00:15:42,174 impeded started. 405 00:15:42,794 --> 00:15:44,014 So in that sense, 406 00:15:44,315 --> 00:15:46,475 I am an electrical engineer to begin with. 407 00:15:46,475 --> 00:15:46,975 And 408 00:15:47,840 --> 00:15:49,379 when I started my PhD, 409 00:15:49,840 --> 00:15:52,320 the the corridors of my depart of the 410 00:15:52,320 --> 00:15:54,820 region I was working on was always resonating 411 00:15:54,960 --> 00:15:55,620 with Hamiltonian, 412 00:15:56,639 --> 00:15:57,139 Quantum. 413 00:15:57,600 --> 00:15:59,360 And I got used to that. So Quantum 414 00:15:59,360 --> 00:16:02,205 means everything to me. And I believe, 415 00:16:02,825 --> 00:16:03,325 the 416 00:16:03,945 --> 00:16:06,845 quantum revolution, if it happens, can be 417 00:16:07,384 --> 00:16:07,884 disruptive. 418 00:16:08,585 --> 00:16:11,945 And I'm really hoping that quantum technologies take 419 00:16:11,945 --> 00:16:12,445 up. 420 00:16:12,839 --> 00:16:15,659 I'm not sure if only computing is the 421 00:16:15,799 --> 00:16:19,019 thing. Computing will definitely speed up certain algorithms, 422 00:16:19,079 --> 00:16:19,819 no doubt. 423 00:16:20,199 --> 00:16:21,019 But I think 424 00:16:21,720 --> 00:16:24,440 surrounding quantum computing is a bunch of quantum 425 00:16:24,440 --> 00:16:25,339 enhanced technologies, 426 00:16:26,274 --> 00:16:27,715 sensing, as well as, 427 00:16:29,075 --> 00:16:29,575 communications 428 00:16:30,034 --> 00:16:33,254 and various other aspects of surrounding quantum. 429 00:16:33,634 --> 00:16:36,115 I'm sure if all this come together, we 430 00:16:36,115 --> 00:16:37,254 should have a great 431 00:16:38,000 --> 00:16:40,959 by twenty forties and early twenty fifties, next 432 00:16:40,959 --> 00:16:42,959 century. Sorry. The the second half of the 433 00:16:42,959 --> 00:16:44,959 century can be, I mean, can be a 434 00:16:44,959 --> 00:16:45,779 very disruptive, 435 00:16:46,959 --> 00:16:48,259 technology for humankind. 436 00:16:48,799 --> 00:16:50,100 So quantum is 437 00:16:50,639 --> 00:16:52,820 means everything to me at least. Yeah. 438 00:16:53,404 --> 00:16:55,085 Well, that's great. Thanks. Thanks so much for 439 00:16:55,085 --> 00:16:56,865 coming on the podcast. Thank you. 440 00:16:57,165 --> 00:16:58,705 It was my pleasure. Thank you. 441 00:17:06,619 --> 00:17:07,840 That was Bhaskaran 442 00:17:08,380 --> 00:17:08,880 Muralidharan 443 00:17:09,820 --> 00:17:12,480 of the Indian Institute of Technology, 444 00:17:12,940 --> 00:17:13,440 Bombay. 445 00:17:14,220 --> 00:17:16,960 He's on the editorial board of the journal 446 00:17:17,340 --> 00:17:17,840 Materials 447 00:17:18,220 --> 00:17:19,680 for Quantum Technology. 448 00:17:20,644 --> 00:17:23,065 It's published by IOP Publishing, 449 00:17:23,524 --> 00:17:26,345 which also brings you Physics World. 450 00:17:27,284 --> 00:17:27,784 Now 451 00:17:28,085 --> 00:17:30,184 moving on to medical physics. 452 00:17:30,804 --> 00:17:33,865 The second segment of this podcast episode 453 00:17:34,410 --> 00:17:37,390 features an interview with the medical ultrasound 454 00:17:37,850 --> 00:17:38,350 expert, 455 00:17:38,730 --> 00:17:39,789 Daniel Sarno, 456 00:17:40,330 --> 00:17:42,190 who is based at The UK's 457 00:17:42,650 --> 00:17:44,269 National Physical Laboratory. 458 00:17:45,210 --> 00:17:46,670 Here he is in conversation 459 00:17:47,210 --> 00:17:49,470 with Physics World's Tammy Freeman. 460 00:17:50,414 --> 00:17:53,134 They look at the role that ultrasound can 461 00:17:53,134 --> 00:17:54,674 play in diagnosing 462 00:17:55,215 --> 00:17:56,035 breast cancer. 463 00:18:04,369 --> 00:18:07,330 Mammography is an effective tool for detecting breast 464 00:18:07,330 --> 00:18:10,070 cancer, and it's widely used in screening programs. 465 00:18:10,690 --> 00:18:11,509 But mammography 466 00:18:11,809 --> 00:18:14,450 exposes patients to X-ray radiation, and it doesn't 467 00:18:14,450 --> 00:18:16,529 work well in dense tissue, which can hide 468 00:18:16,529 --> 00:18:17,910 the presence of a tumor. 469 00:18:19,035 --> 00:18:21,695 Researchers at The UK's National Physical Laboratory 470 00:18:22,234 --> 00:18:25,035 have developed an ultrasound based system that can 471 00:18:25,035 --> 00:18:28,174 provide safe, low cost breast density assessment, 472 00:18:28,634 --> 00:18:30,634 and NPL is now looking to spin out 473 00:18:30,634 --> 00:18:33,674 a company, Sona, to bring this technology to 474 00:18:33,674 --> 00:18:34,174 market. 475 00:18:34,829 --> 00:18:36,849 I'm speaking today with Daniel Sarno, 476 00:18:37,230 --> 00:18:40,589 Sona's cofounder and chief technology officer. Welcome to 477 00:18:40,589 --> 00:18:41,730 the podcast, Daniel. 478 00:18:42,349 --> 00:18:43,730 Hi. Thanks for having me. 479 00:18:44,429 --> 00:18:47,069 So can we start by looking at what 480 00:18:47,069 --> 00:18:47,809 are the limitations 481 00:18:48,190 --> 00:18:49,409 of current mammography 482 00:18:49,710 --> 00:18:51,164 based cancer screening? 483 00:18:52,265 --> 00:18:53,325 Screening in general 484 00:18:53,625 --> 00:18:55,944 as a, as a tool used by health 485 00:18:55,944 --> 00:18:56,605 care systems 486 00:18:57,144 --> 00:18:58,444 aims at detecting 487 00:18:59,305 --> 00:19:03,005 early signs of cancer in mostly asymptomatic populations. 488 00:19:03,785 --> 00:19:05,849 So breast cancer screening, for instance, 489 00:19:06,329 --> 00:19:08,269 in The UK, at least is 490 00:19:08,650 --> 00:19:11,450 offered for women aged 50 onwards every three 491 00:19:11,450 --> 00:19:11,950 years. 492 00:19:12,890 --> 00:19:13,950 And the 493 00:19:14,410 --> 00:19:15,929 the reason why we do this is that 494 00:19:15,929 --> 00:19:17,849 the breast cancer is the most common cause 495 00:19:17,849 --> 00:19:18,750 of cancer, 496 00:19:19,289 --> 00:19:19,789 in 497 00:19:20,089 --> 00:19:20,990 women worldwide. 498 00:19:21,744 --> 00:19:22,244 There's 499 00:19:22,625 --> 00:19:24,865 over three point three million new cases each 500 00:19:24,865 --> 00:19:25,365 year. 501 00:19:25,825 --> 00:19:27,904 And in The UK, there are about fifty 502 00:19:27,904 --> 00:19:28,884 seven thousand 503 00:19:29,424 --> 00:19:31,525 new cases with increasing rates 504 00:19:31,904 --> 00:19:33,284 mainly in younger women. 505 00:19:34,470 --> 00:19:36,549 Now the reason why we do screening is 506 00:19:36,549 --> 00:19:37,769 that we want to detect 507 00:19:38,309 --> 00:19:39,690 breast cancer earlier. 508 00:19:39,990 --> 00:19:42,309 If we detect breast cancer earlier, particularly at 509 00:19:42,309 --> 00:19:42,809 stage 510 00:19:43,109 --> 00:19:45,210 one, so when cancers are localized, 511 00:19:45,910 --> 00:19:48,464 survival rates are near a hundred percent is 512 00:19:48,784 --> 00:19:50,565 incredibly survivable cancer. 513 00:19:52,144 --> 00:19:54,804 Issue is when cancers are dissected much later 514 00:19:55,265 --> 00:19:56,005 in stages 515 00:19:56,384 --> 00:19:56,784 four 516 00:19:57,265 --> 00:20:00,244 in predominantly stage four where cancers have metastasized 517 00:20:00,464 --> 00:20:02,190 and gone to multiple sites, 518 00:20:03,149 --> 00:20:05,549 where survival rates then dropped sadly to as 519 00:20:05,549 --> 00:20:06,929 low as twenty two percent, 520 00:20:07,629 --> 00:20:08,609 in some countries. 521 00:20:09,789 --> 00:20:12,369 So screening aims to find cancer 522 00:20:12,829 --> 00:20:14,204 earlier when it's more treatable. 523 00:20:15,644 --> 00:20:17,565 Treatable. And like I said, for most women, 524 00:20:17,565 --> 00:20:18,384 it's offered 525 00:20:19,005 --> 00:20:20,924 at either 40 or 50 depending on what 526 00:20:20,924 --> 00:20:22,144 country you live in. 527 00:20:24,284 --> 00:20:27,599 With the main tool that's used is, mammography. 528 00:20:27,819 --> 00:20:30,799 So mammography is a X-ray based 529 00:20:31,099 --> 00:20:31,599 imaging 530 00:20:32,059 --> 00:20:32,559 system. 531 00:20:33,819 --> 00:20:34,319 Most 532 00:20:34,619 --> 00:20:35,119 notably, 533 00:20:35,980 --> 00:20:37,659 requires compression of the brass, which is sort 534 00:20:37,659 --> 00:20:39,259 of what most people think of when they 535 00:20:39,259 --> 00:20:40,079 think of mammography. 536 00:20:41,154 --> 00:20:43,174 The issue actually is that 537 00:20:43,555 --> 00:20:45,095 different breasts have different 538 00:20:45,394 --> 00:20:45,894 compositions. 539 00:20:46,434 --> 00:20:47,575 Some women have 540 00:20:48,035 --> 00:20:50,674 higher amount of fibro glandular tissue in the 541 00:20:50,674 --> 00:20:53,414 breast. Some women have more fatty breast tissue. 542 00:20:54,035 --> 00:20:55,279 But mammography 543 00:20:55,740 --> 00:20:56,240 performance 544 00:20:57,259 --> 00:20:59,440 really depends on breast composition. 545 00:20:59,900 --> 00:21:02,059 Women with the highest density of breast, that's 546 00:21:02,059 --> 00:21:04,160 to say, women with mostly 547 00:21:04,700 --> 00:21:06,000 fibro glandular tissue, 548 00:21:07,259 --> 00:21:08,559 the performance of mammography 549 00:21:09,019 --> 00:21:09,519 diminishes 550 00:21:09,944 --> 00:21:10,444 drastically. 551 00:21:11,544 --> 00:21:13,724 For women with batty breast tissue, 552 00:21:14,744 --> 00:21:17,304 mammography the sensitivity of mammography, which is sort 553 00:21:17,304 --> 00:21:17,964 of the 554 00:21:18,424 --> 00:21:20,345 the metric by which you can assess the 555 00:21:20,345 --> 00:21:22,505 performance of this tool, is as high as 556 00:21:22,505 --> 00:21:23,724 ninety percent. So 557 00:21:24,660 --> 00:21:26,420 most of the cancers that are present in 558 00:21:26,420 --> 00:21:29,460 women with the lowest density breast tissue are 559 00:21:29,460 --> 00:21:30,519 picked up by mammography. 560 00:21:31,299 --> 00:21:34,359 For women with, highest breast density categories, 561 00:21:34,980 --> 00:21:37,775 the performance of mammography drops to as low 562 00:21:37,775 --> 00:21:38,914 as 50% 563 00:21:39,454 --> 00:21:39,954 sensitivity. 564 00:21:40,575 --> 00:21:42,355 That's to say, if a cancer is present, 565 00:21:42,654 --> 00:21:44,335 almost half of the time, it will be 566 00:21:44,335 --> 00:21:44,835 missed. 567 00:21:45,214 --> 00:21:45,954 But the 568 00:21:46,414 --> 00:21:49,519 onset con consequence of that being that cancer 569 00:21:49,519 --> 00:21:50,740 is picked up later 570 00:21:51,519 --> 00:21:53,619 or in a kind of a subsequent screening 571 00:21:53,839 --> 00:21:54,339 opportunity. 572 00:21:55,440 --> 00:21:55,940 Now 573 00:21:56,559 --> 00:21:59,200 this limitation of mammography has been known for 574 00:21:59,200 --> 00:22:00,099 a long time, 575 00:22:01,119 --> 00:22:04,595 but it mammography still remains the best tool 576 00:22:04,595 --> 00:22:07,255 we have. It's the gold standard tool for 577 00:22:07,555 --> 00:22:09,095 breast cancer screening. 578 00:22:09,555 --> 00:22:11,795 But there are other tools out there, other 579 00:22:11,795 --> 00:22:13,654 modalities for breast cancer screening. 580 00:22:14,515 --> 00:22:16,410 Some of them being ultrasound based. 581 00:22:16,890 --> 00:22:18,730 There is MRI, which is, 582 00:22:19,369 --> 00:22:20,590 obviously, a very costly 583 00:22:20,970 --> 00:22:21,630 but effective 584 00:22:22,490 --> 00:22:22,990 tool. 585 00:22:23,450 --> 00:22:26,349 There's other there's different types of mammography, such 586 00:22:26,730 --> 00:22:27,549 as, tomosynthesis, 587 00:22:28,330 --> 00:22:30,170 a a a version of mammography that's sort 588 00:22:30,170 --> 00:22:32,575 of this pseudo three d imaging, 589 00:22:33,434 --> 00:22:36,494 and contrast enhanced mammography. So there's a plethora 590 00:22:36,555 --> 00:22:37,934 of tools beyond mammography 591 00:22:38,634 --> 00:22:39,455 that can be, 592 00:22:39,835 --> 00:22:42,555 used as screening for women with different breast 593 00:22:42,555 --> 00:22:43,055 densities. 594 00:22:44,150 --> 00:22:44,789 Okay. So, 595 00:22:45,429 --> 00:22:48,710 Sona is developing the ultrasound based approach. So 596 00:22:48,710 --> 00:22:51,769 what what are the advantage advantages of ultrasound 597 00:22:51,990 --> 00:22:53,690 scans over X-ray imaging? 598 00:22:55,190 --> 00:22:57,509 Yeah. So what we're doing at Sona is 599 00:22:57,509 --> 00:22:58,169 we're actually 600 00:22:59,795 --> 00:23:02,295 providing a tool or developing a tool 601 00:23:02,835 --> 00:23:05,654 that can do breast density assessment. So this 602 00:23:06,275 --> 00:23:08,994 is not breast cancer screening. So we're we're 603 00:23:08,994 --> 00:23:11,734 not trying to do the job of mammography 604 00:23:11,955 --> 00:23:13,049 in trying to detect 605 00:23:13,450 --> 00:23:15,230 cancers at the earliest, 606 00:23:16,730 --> 00:23:17,230 stages. 607 00:23:17,690 --> 00:23:19,390 Instead, we're trying to measure 608 00:23:19,930 --> 00:23:20,430 global, 609 00:23:21,210 --> 00:23:22,990 metrics of breast composition 610 00:23:23,769 --> 00:23:26,170 such that women can be provided with the 611 00:23:26,170 --> 00:23:28,855 right forms of breast cancer screening at the 612 00:23:28,855 --> 00:23:31,095 right time for them based off their breast 613 00:23:31,095 --> 00:23:31,595 composition. 614 00:23:32,934 --> 00:23:34,795 And some of the advantages of, 615 00:23:35,575 --> 00:23:38,075 of ultrasound over X-ray imaging 616 00:23:38,535 --> 00:23:40,420 is that, of course, the kind of natural 617 00:23:40,420 --> 00:23:41,619 one that I think most people would think 618 00:23:41,619 --> 00:23:44,200 of is the X-ray imaging is a ionizing 619 00:23:44,660 --> 00:23:46,279 based imaging tool. 620 00:23:46,900 --> 00:23:50,580 This limits its use both in kind of 621 00:23:50,580 --> 00:23:51,640 setting that these, 622 00:23:52,259 --> 00:23:54,119 mammogram scans can be provided, 623 00:23:54,464 --> 00:23:56,644 but also the frequency with which 624 00:23:57,025 --> 00:23:58,884 mammogram imaging can be provided. 625 00:24:00,625 --> 00:24:01,525 But ultrasound, 626 00:24:02,065 --> 00:24:04,644 in contrast, is a safe tool. 627 00:24:05,025 --> 00:24:06,005 It's non ionizing. 628 00:24:06,865 --> 00:24:08,085 It's, accessible 629 00:24:08,464 --> 00:24:09,204 and portable. 630 00:24:09,559 --> 00:24:12,220 It's actually it's the second most commonly used 631 00:24:12,359 --> 00:24:14,220 imaging modality worldwide. 632 00:24:14,919 --> 00:24:16,859 So it's very pervasive for that reason. 633 00:24:18,039 --> 00:24:20,679 Okay. And can you explain how your system 634 00:24:20,679 --> 00:24:23,579 actually uses the ultrasound to measure tissue density? 635 00:24:25,214 --> 00:24:27,474 Tissue density, breast density in particular, 636 00:24:30,095 --> 00:24:33,694 to repeat, is important for to understand for 637 00:24:33,694 --> 00:24:34,674 two reasons. 638 00:24:35,775 --> 00:24:36,275 Firstly, 639 00:24:37,375 --> 00:24:38,835 breast high breast density 640 00:24:39,134 --> 00:24:40,115 actually increases 641 00:24:40,650 --> 00:24:43,609 cancer risk. Seventy percent of all cancers are 642 00:24:43,609 --> 00:24:46,109 detected in women with dense breasts. 643 00:24:47,130 --> 00:24:48,109 Now how pervasive 644 00:24:48,570 --> 00:24:49,950 is is breast density? 645 00:24:50,330 --> 00:24:51,070 Well, about 646 00:24:51,690 --> 00:24:53,609 half of all women over the age of 647 00:24:53,609 --> 00:24:55,630 40 have dense breasts. It it varies 648 00:24:56,255 --> 00:24:59,154 from individual to individual and varies with age, 649 00:24:59,294 --> 00:25:01,315 but about half of all women have 650 00:25:01,694 --> 00:25:02,674 high breast density. 651 00:25:03,694 --> 00:25:06,014 It increases cancer risk, so women with the 652 00:25:06,014 --> 00:25:07,794 highest category of breast density 653 00:25:08,190 --> 00:25:10,190 can be up to six times more likely 654 00:25:10,190 --> 00:25:12,269 to develop breast cancer than women with the 655 00:25:12,269 --> 00:25:13,809 lowest category of breast density. 656 00:25:14,589 --> 00:25:17,069 But just to repeat, the the other impacts 657 00:25:17,069 --> 00:25:19,710 of high breast density is this this effect 658 00:25:19,710 --> 00:25:22,349 that it has in reducing the performance of 659 00:25:22,349 --> 00:25:26,105 mammography. So high breast density can mask answers 660 00:25:26,105 --> 00:25:27,164 on screening mammograms 661 00:25:27,625 --> 00:25:28,924 and reduces performance. 662 00:25:30,265 --> 00:25:31,964 Breastness is currently assessed 663 00:25:33,545 --> 00:25:36,445 at screen at the screening opportunity using mammogram 664 00:25:36,505 --> 00:25:39,400 images. So a mammogram image will be, 665 00:25:39,940 --> 00:25:42,500 taken of an individual going through screening. That 666 00:25:42,500 --> 00:25:44,759 mammogram image can be used 667 00:25:45,299 --> 00:25:48,019 to find any cancers present in the breast 668 00:25:48,019 --> 00:25:48,519 tissue. 669 00:25:48,980 --> 00:25:50,994 But, also, the image can be looked at 670 00:25:50,994 --> 00:25:54,055 globally by either a clinician or software interpretation 671 00:25:54,994 --> 00:25:55,654 to see 672 00:25:56,355 --> 00:25:57,255 by either 673 00:25:57,555 --> 00:25:59,894 visually by eye or or by using algorithms 674 00:26:00,595 --> 00:26:02,914 the ratio of fat to fibroblegial tissue and 675 00:26:02,914 --> 00:26:05,015 give a metric for breast density. 676 00:26:06,130 --> 00:26:06,450 That's 677 00:26:07,089 --> 00:26:07,829 it has 678 00:26:08,130 --> 00:26:08,630 proven 679 00:26:09,009 --> 00:26:09,509 incredibly 680 00:26:09,809 --> 00:26:10,309 useful. 681 00:26:11,250 --> 00:26:13,589 In fact, the US FDA 682 00:26:14,210 --> 00:26:18,865 recently changed their reporting guidelines for women across 683 00:26:18,865 --> 00:26:21,525 The US to mandate breast density assessment, 684 00:26:22,305 --> 00:26:23,525 across all states, 685 00:26:24,545 --> 00:26:27,265 such that, you know, it it's it's considered 686 00:26:27,265 --> 00:26:29,924 such a an important factor to measure that 687 00:26:30,065 --> 00:26:32,244 The US actually have mandated this reporting. 688 00:26:33,350 --> 00:26:36,070 So the issue with mammogram based breast density 689 00:26:36,070 --> 00:26:36,570 assessment 690 00:26:37,590 --> 00:26:41,210 is that it actually is not particularly consistent. 691 00:26:42,070 --> 00:26:43,610 Studies have found that 692 00:26:43,990 --> 00:26:46,330 breast density assessment done by clinicians 693 00:26:47,075 --> 00:26:49,954 varies depending on which clinician you have. It 694 00:26:49,954 --> 00:26:53,174 varies from screening opportunity to screening opportunity. 695 00:26:54,275 --> 00:26:55,815 And also breast density assessment 696 00:26:56,194 --> 00:26:58,994 with mammography is not accessible. So at the 697 00:26:58,994 --> 00:27:01,349 moment, you only find out if you have 698 00:27:01,650 --> 00:27:02,630 high breast density 699 00:27:03,089 --> 00:27:04,789 at your first screening opportunity. 700 00:27:06,529 --> 00:27:08,929 Now coming from the National Physical Laboratory, we 701 00:27:08,929 --> 00:27:11,190 see that this is a a measurement challenge. 702 00:27:11,835 --> 00:27:13,534 And being an ultrasound scientist 703 00:27:14,234 --> 00:27:16,875 and believing that ultrasound is a particularly useful 704 00:27:16,875 --> 00:27:18,174 technology to use, 705 00:27:18,875 --> 00:27:20,954 we believe that we can do breast density 706 00:27:20,954 --> 00:27:21,454 assessment 707 00:27:21,755 --> 00:27:23,214 using ultrasound measurement. 708 00:27:23,595 --> 00:27:26,210 Now how it works is we do something 709 00:27:26,210 --> 00:27:29,970 known as, global acoustic attenuation measurements of the 710 00:27:29,970 --> 00:27:30,470 breast. 711 00:27:31,250 --> 00:27:34,049 That's to say, how much does the breast 712 00:27:34,049 --> 00:27:34,549 tissue 713 00:27:34,849 --> 00:27:35,349 diminish 714 00:27:36,129 --> 00:27:38,529 their ultrasound signals as they pass through the 715 00:27:38,529 --> 00:27:38,924 breast? 716 00:27:39,884 --> 00:27:42,865 With women with higher breast density having 717 00:27:43,164 --> 00:27:43,664 higher 718 00:27:43,965 --> 00:27:44,945 acoustic attenuation, 719 00:27:46,125 --> 00:27:49,325 properties of the breast tissue compared to women 720 00:27:49,325 --> 00:27:51,025 with lower breast density. 721 00:27:52,285 --> 00:27:53,940 So our system was 722 00:27:54,500 --> 00:27:56,500 developed at the National Physical Laboratory over a 723 00:27:56,500 --> 00:27:57,879 number of years. We've developed 724 00:27:58,259 --> 00:28:01,240 a new form of ultrasound sensor to 725 00:28:01,859 --> 00:28:03,240 measure this property 726 00:28:03,700 --> 00:28:05,319 in a quantitative way. 727 00:28:06,019 --> 00:28:08,704 And what that actually unlocks is the ability 728 00:28:08,765 --> 00:28:09,265 to, 729 00:28:09,644 --> 00:28:10,944 a, measure 730 00:28:11,404 --> 00:28:12,144 breast density, 731 00:28:12,525 --> 00:28:14,464 in a repeatable, consistent way. 732 00:28:15,484 --> 00:28:15,984 But, 733 00:28:16,365 --> 00:28:19,804 b, you're actually able to now monitor breast 734 00:28:19,804 --> 00:28:20,304 density 735 00:28:21,119 --> 00:28:21,940 over time 736 00:28:22,559 --> 00:28:23,059 with, 737 00:28:24,079 --> 00:28:26,160 so rather than just a a single measurement 738 00:28:26,160 --> 00:28:27,059 of breast density, 739 00:28:27,519 --> 00:28:28,900 you're now able to 740 00:28:29,519 --> 00:28:30,900 do repeat measurements, 741 00:28:31,839 --> 00:28:33,140 which have been found 742 00:28:33,519 --> 00:28:36,605 to also relate to breast cancer risk. Women 743 00:28:36,605 --> 00:28:39,244 who whose breast density does not drop as 744 00:28:39,244 --> 00:28:40,144 fast as 745 00:28:40,445 --> 00:28:42,945 you might expect in, across the population 746 00:28:43,325 --> 00:28:45,644 have actually a higher rate of breast cancer 747 00:28:45,644 --> 00:28:46,945 than women who've not. 748 00:28:48,009 --> 00:28:50,089 Okay. So, you could use your system to 749 00:28:50,089 --> 00:28:52,730 sort of track the differences in density over 750 00:28:52,730 --> 00:28:53,230 time, 751 00:28:53,769 --> 00:28:54,269 possibly 752 00:28:54,809 --> 00:28:57,470 starting at a younger age for the screening, 753 00:28:57,529 --> 00:28:58,589 and then you can 754 00:28:58,890 --> 00:29:00,375 interpret those results. And then, 755 00:29:00,934 --> 00:29:03,174 if it looks like someone's more at risk, 756 00:29:03,174 --> 00:29:05,194 would they then be sent on for mammography 757 00:29:05,335 --> 00:29:06,315 screening afterwards? 758 00:29:08,214 --> 00:29:10,234 Exactly. Yeah. So we 759 00:29:10,615 --> 00:29:11,914 we believe that 760 00:29:12,454 --> 00:29:15,275 what's needed for breast cancer screening 761 00:29:15,799 --> 00:29:16,299 is 762 00:29:16,759 --> 00:29:17,259 early 763 00:29:17,799 --> 00:29:19,500 breast cancer risk assessment. 764 00:29:20,440 --> 00:29:22,279 At the moment, we can do breast cancer 765 00:29:22,279 --> 00:29:23,019 risk assessment 766 00:29:23,480 --> 00:29:25,660 using factors such as history 767 00:29:26,519 --> 00:29:27,740 or even genetics. 768 00:29:28,715 --> 00:29:31,115 But breast density, because at the moment, it's 769 00:29:31,115 --> 00:29:31,615 done 770 00:29:31,914 --> 00:29:33,295 with mammogram based, 771 00:29:34,955 --> 00:29:35,455 imaging, 772 00:29:36,234 --> 00:29:38,414 cannot be done at an earlier age. 773 00:29:39,035 --> 00:29:39,535 So 774 00:29:40,315 --> 00:29:41,375 with our technology, 775 00:29:41,835 --> 00:29:44,080 you could bring breast density assessment 776 00:29:44,619 --> 00:29:45,119 before 777 00:29:45,420 --> 00:29:45,920 screening 778 00:29:46,700 --> 00:29:47,920 such that you can then 779 00:29:48,460 --> 00:29:52,460 plan an onward personalized screening program that's fit 780 00:29:52,460 --> 00:29:55,820 for the individual rather than just using age 781 00:29:55,820 --> 00:29:56,320 based, 782 00:29:57,099 --> 00:29:58,240 screening profiles. 783 00:29:59,865 --> 00:30:01,305 So, I mean, where would you see these 784 00:30:01,305 --> 00:30:03,785 systems being deployed? Would this be something perhaps 785 00:30:03,785 --> 00:30:05,705 that you're just local doctors that it would 786 00:30:05,705 --> 00:30:07,465 be just sort of part of a a 787 00:30:07,465 --> 00:30:10,265 routine test that women would undergo? Like, whilst 788 00:30:10,265 --> 00:30:12,025 they're too young to actually go into the 789 00:30:12,025 --> 00:30:13,005 screening program, 790 00:30:13,910 --> 00:30:14,789 They they could have this, 791 00:30:15,990 --> 00:30:17,289 measurement taken beforehand. 792 00:30:19,349 --> 00:30:21,289 Yeah. So the the technology that we're developing 793 00:30:21,429 --> 00:30:21,929 is 794 00:30:22,470 --> 00:30:24,970 is incredibly accessible. Like I said, it uses 795 00:30:25,109 --> 00:30:27,734 ultrasound, so it doesn't require a dedicated 796 00:30:28,434 --> 00:30:28,934 facility. 797 00:30:30,514 --> 00:30:31,014 It's 798 00:30:31,634 --> 00:30:34,674 aimed to be a desktop sized device, so 799 00:30:34,674 --> 00:30:35,174 small. 800 00:30:36,274 --> 00:30:36,774 And 801 00:30:37,234 --> 00:30:38,615 that opens up the possibility 802 00:30:39,154 --> 00:30:40,375 of screening. 803 00:30:40,710 --> 00:30:41,109 Of 804 00:30:41,669 --> 00:30:43,049 sorry. Breast density assessment 805 00:30:43,750 --> 00:30:45,690 being much more accessible 806 00:30:46,230 --> 00:30:47,529 than it currently is. 807 00:30:48,390 --> 00:30:50,149 So we aim to have these devices in 808 00:30:50,149 --> 00:30:51,289 primary care clinics, 809 00:30:52,069 --> 00:30:52,569 in, 810 00:30:53,029 --> 00:30:54,649 breast cancer screening programs, 811 00:30:55,829 --> 00:30:56,329 in 812 00:30:56,744 --> 00:30:58,845 remote or low resource areas, 813 00:30:59,224 --> 00:31:01,565 and also a part of work workplace 814 00:31:02,025 --> 00:31:03,644 and community health initiatives. 815 00:31:04,664 --> 00:31:05,384 Okay. So, 816 00:31:06,025 --> 00:31:08,525 has the system been tested in patients yet? 817 00:31:09,630 --> 00:31:12,190 It has. The the the the system and 818 00:31:12,190 --> 00:31:13,730 technology actually has 819 00:31:14,029 --> 00:31:14,849 quite a, 820 00:31:15,470 --> 00:31:16,289 long lineage. 821 00:31:16,910 --> 00:31:17,410 Originally, 822 00:31:17,789 --> 00:31:20,690 as I described, we've developed new sensor technology, 823 00:31:21,390 --> 00:31:23,390 a number of years ago, and we've gone 824 00:31:23,734 --> 00:31:26,555 We've evolved from early proof of concept sensors 825 00:31:27,015 --> 00:31:28,634 through to research platforms 826 00:31:29,174 --> 00:31:29,914 and, initially, 827 00:31:30,375 --> 00:31:34,775 measurement validation in in acoustic materials and breast 828 00:31:34,775 --> 00:31:35,275 phantoms. 829 00:31:37,250 --> 00:31:38,850 A couple years ago, we actually did our 830 00:31:38,850 --> 00:31:40,070 first in person testing 831 00:31:40,529 --> 00:31:41,910 to validate these measurements, 832 00:31:42,850 --> 00:31:44,549 in a few people. 833 00:31:45,809 --> 00:31:48,230 At the moment, we're being supported by the 834 00:31:48,769 --> 00:31:51,029 government office for technology 835 00:31:51,330 --> 00:31:51,830 transfer 836 00:31:52,535 --> 00:31:55,255 and also by the UK Innovation and Science 837 00:31:55,255 --> 00:31:56,075 Seed Fund. 838 00:31:56,535 --> 00:31:59,595 And we're developing a proof of concept 839 00:31:59,894 --> 00:32:00,394 prototype 840 00:32:01,095 --> 00:32:02,075 that will initially 841 00:32:02,454 --> 00:32:03,595 conduct preclinical 842 00:32:03,894 --> 00:32:04,394 testing 843 00:32:04,750 --> 00:32:07,250 and later further in person testing. 844 00:32:07,710 --> 00:32:09,309 And the aim of this system really is 845 00:32:09,309 --> 00:32:11,309 to go from what we've had before, which 846 00:32:11,309 --> 00:32:13,409 is a series of research platforms, 847 00:32:13,950 --> 00:32:16,829 something that's much closer to a clinical ready 848 00:32:16,829 --> 00:32:18,224 device in a, 849 00:32:18,865 --> 00:32:21,424 in a configuration where we could do accessible 850 00:32:21,424 --> 00:32:24,724 breast density assessment using through transmission ultrasound. 851 00:32:26,545 --> 00:32:27,445 Okay. And 852 00:32:28,224 --> 00:32:30,785 so this this company, Sonar, is being set 853 00:32:30,785 --> 00:32:33,859 up basically to bring this technology to the 854 00:32:33,859 --> 00:32:35,159 market. I mean, 855 00:32:35,539 --> 00:32:37,139 can you just sort of quickly update on 856 00:32:37,139 --> 00:32:38,039 how that's progressing? 857 00:32:38,419 --> 00:32:40,339 How long do you think it might take 858 00:32:40,339 --> 00:32:43,000 until the these systems are actually ready for 859 00:32:43,220 --> 00:32:44,279 clinical use? 860 00:32:45,779 --> 00:32:47,319 Yeah. So we're we're we're 861 00:32:47,855 --> 00:32:50,674 we're making some great progress. We understand that 862 00:32:50,815 --> 00:32:51,875 it's very challenging 863 00:32:52,335 --> 00:32:53,875 to bring medical technology 864 00:32:54,335 --> 00:32:56,255 to the market, but we are up for 865 00:32:56,255 --> 00:32:56,914 the challenge. 866 00:32:58,174 --> 00:33:00,480 This sort of technology, we think, will be 867 00:33:00,720 --> 00:33:03,599 able to be deployed in '27 2027 868 00:33:03,599 --> 00:33:04,799 or 2028. 869 00:33:04,799 --> 00:33:06,980 That's what we're we're aiming for, 870 00:33:07,679 --> 00:33:10,079 with this year going through a series of 871 00:33:10,079 --> 00:33:11,220 preclinical testing 872 00:33:11,839 --> 00:33:14,900 and next year into clinical trials and clinical 873 00:33:15,200 --> 00:33:18,255 studies where we will compare our ultrasound based 874 00:33:18,394 --> 00:33:20,894 method for breast density assessment with, 875 00:33:21,515 --> 00:33:25,055 traditional mammogram based methods for breast density assessment. 876 00:33:25,994 --> 00:33:28,075 Now, yep, we know there's a lot of 877 00:33:28,075 --> 00:33:28,559 work, 878 00:33:29,519 --> 00:33:31,620 today to get this to the market, 879 00:33:32,240 --> 00:33:35,140 but, but we're not alone. So we've actually, 880 00:33:35,360 --> 00:33:37,519 this year, brought on a great team of 881 00:33:37,519 --> 00:33:41,860 experienced entrepreneurs and world leaders in ultrasound innovation 882 00:33:42,000 --> 00:33:43,424 and product development, 883 00:33:44,205 --> 00:33:46,464 and importantly, breast radiologists as well. 884 00:33:47,244 --> 00:33:50,205 Excellent. Right. Well, thanks very much. It sounds 885 00:33:50,205 --> 00:33:51,904 like a really promising technology. 886 00:33:53,244 --> 00:33:55,744 And thank you for speaking with us today. 887 00:34:03,830 --> 00:34:06,570 That was Daniel Sarno of NPL 888 00:34:06,950 --> 00:34:07,769 and Sona 889 00:34:08,309 --> 00:34:09,050 in conversation 890 00:34:09,430 --> 00:34:11,530 with Physics World's Tammy Freeman. 891 00:34:12,494 --> 00:34:14,335 I'm afraid that's all the time we have 892 00:34:14,335 --> 00:34:15,554 for this week's podcast. 893 00:34:16,094 --> 00:34:17,234 Thanks to Bhaskaran, 894 00:34:17,775 --> 00:34:18,275 Muralidharan, 895 00:34:19,454 --> 00:34:20,514 Daniel Sarno, 896 00:34:20,815 --> 00:34:23,554 and Tammy Freeman for joining me today. 897 00:34:23,934 --> 00:34:26,494 And a special thanks to our producer, Fred 898 00:34:26,494 --> 00:34:26,994 Isles. 899 00:34:27,690 --> 00:34:30,250 We'll be back again next week. See you 900 00:34:30,250 --> 00:34:30,750 then.