tag:blogger.com,1999:blog-22973357.post2649778808176320195..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Don't Fall for Quantum HypeSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger46125tag:blogger.com,1999:blog-22973357.post-85796354029668856272021-03-11T07:01:53.948-05:002021-03-11T07:01:53.948-05:00While quantum computation indeed can only give a s...While quantum computation indeed can only give a speedup for a certain problem, the kind of program quantum computation can give a speed up is the important one like artificial intelligence, and if it manages to reach desktop computing, computer graphics.Akangkahttps://www.blogger.com/profile/15285810190659965553noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-18080850541177694542021-02-24T21:25:47.598-05:002021-02-24T21:25:47.598-05:00Regarding: "Now, quantum simulations are real...Regarding: "Now, quantum simulations are really cool from the perspective of basic research, because they allow you to learn a great deal. You can for example simulate particles similar to the Higgs or certain types of neutrinos, and learn something about their behavior, which you couldn’t do in any other way."<br /><br />There is a formal analogy between the Higgs mechanism and Axilhttps://www.blogger.com/profile/07190120527431077518noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25914865995424667782021-02-20T08:42:34.870-05:002021-02-20T08:42:34.870-05:00About quantum computer, I wonder how useful they r...About quantum computer, I wonder how useful they really could be. <br />You can not read a qubit without destroying it (by collapsing it), and you can not copy a qubit for the same reason. So, in a quantum computer program, you can not use the "if" nor the "loop" construct. The program flow has to be linear from start to finish. <br />Some quantum algorithms are known, like eltodesukanehttps://www.blogger.com/profile/16094897090947786523noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-72797706853432309032021-02-15T23:48:28.133-05:002021-02-15T23:48:28.133-05:00Joanna,
What you say is incorrect. You misunderst...Joanna,<br /><br />What you say is incorrect. You misunderstand what "supremacy" means. It merely means you have a quantum computer that can do some things faster than a conventional computer. It does not mean that this computation is actually good for something. And since any molecule can "compute" something faster than a regular computer (eg its energy bands) that means Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-70855740035096108342021-02-15T15:10:47.504-05:002021-02-15T15:10:47.504-05:00It’s not true that you need a million qubits to ge...It’s not true that you need a million qubits to get anything useful. Actually with a couple of hundred qubits you will get far superior computer than the fastest supercomputers in the world <br />https://spectrum.ieee.org/tech-talk/computing/hardware/qubit-supremacyJonnahttps://www.blogger.com/profile/08181367655364575974noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-30462444457397447242021-02-10T19:22:22.953-05:002021-02-10T19:22:22.953-05:00Looking back in 20 years is fair enough. We still ...Looking back in 20 years is fair enough. We still want to see it in our lifetime, after all.<br /><br />This part got me thinking that getting useful stuff ready and (re)usable for a wider public without waiting too long could sometimes be a good idea. Because even after it is finished, it will still take a long time before it gets (re)used by others. Of course, there are all those other tasks Jakitohttps://www.blogger.com/profile/08235089048981338795noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91766410819549679772021-02-10T15:37:56.602-05:002021-02-10T15:37:56.602-05:00The quantum is in the fact that the research leadi...The quantum is in the fact that the research leading to the breakthrough was in quantum computing. Note that the master thesis was supervised by Scott Aaronson, whose speciality is theoretical computer science related to quantum computing.Jakitohttps://www.blogger.com/profile/08235089048981338795noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-17593037231211750972021-02-10T12:34:36.018-05:002021-02-10T12:34:36.018-05:00This comment has been removed by the author.Jayhttps://www.blogger.com/profile/03001426991222495286noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-79313690950082697672021-02-10T01:04:56.208-05:002021-02-10T01:04:56.208-05:00Jay,
"Well you sort of described the idea yo...Jay,<br /><br /><i>"Well you sort of described the idea yourself in "As long as you can put your qubits together in one fridge it'll be fine. After that?": that's the same question as "does it scale"."</i><br /><br />Yes, I "sort of" described what I meant in the hope that it would further your comprehension, though, seeing your response, that seemsSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-79831576698912734702021-02-09T14:02:19.152-05:002021-02-09T14:02:19.152-05:00I think you can make a good case that Google's...I think you can make a good case that Google's experiment demonstrated quantum supremacy, even if you could simulate the behavior of their 53-qubit computer with 2.5 days of compute time on a 250 petabyte machine (the largest-memory computing machine currently in existence). Peter Shorhttps://www.blogger.com/profile/13823970640202949073noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45441449884742864012021-02-09T13:47:56.454-05:002021-02-09T13:47:56.454-05:00This comment has been removed by the author.Jayhttps://www.blogger.com/profile/03001426991222495286noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-64463092801702684252021-02-09T12:40:18.204-05:002021-02-09T12:40:18.204-05:00Jay,
I have never heard the question "Does i...Jay,<br /><br />I have never heard the question "Does it scale?" to refer to anything but questions of profit and economics, see eg <a href="https://www.merriam-webster.com/words-at-play/scale-the-business-meaning-origin" rel="nofollow">here</a>. I have no problem whatsoever with Peter laying out his opinions about quantum supremacy, should he desire to do so; I don't know what Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3654205361416001712021-02-09T11:42:22.219-05:002021-02-09T11:42:22.219-05:00This comment has been removed by the author.Jayhttps://www.blogger.com/profile/03001426991222495286noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-7078616338977050622021-02-09T11:22:19.918-05:002021-02-09T11:22:19.918-05:00Sabine,
FWIW I find your blog post excellent as c...Sabine, <br />FWIW I find your blog post excellent as compared to 99% of any attempted popularization I've read on this topic. It do however reads as if you believe there's a technological limitation: "does it scales" is exactly what experts say when they mean "is it just a technical problem". If you were actually referring to an economical question, that sounds like Jayhttps://www.blogger.com/profile/03001426991222495286noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47565435475070841262021-02-09T10:50:36.269-05:002021-02-09T10:50:36.269-05:00Classic example of a term with two meanings.
Jay:...Classic example of a term with two meanings.<br /><br />Jay: Jakito is not talking about a specific application of cryptography here, but about the fact that there is no way to determine whether any random-looking signal really originated from random source – or the output of, well, basically any cryptographic encoder that's worth its money.smurfixhttps://www.blogger.com/profile/02846176827268520748noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47951415766312285652021-02-09T10:25:37.884-05:002021-02-09T10:25:37.884-05:00Jay,
The name of that function does not mean wha...Jay, <br /><br />The name of that function does not mean what you evidently think it means. Did you actually read the Wikipedia entry?Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-57530050124786598202021-02-09T10:23:54.303-05:002021-02-09T10:23:54.303-05:00Jay,
When I ask "does it scale" I am, n...Jay,<br /><br />When I ask "does it scale" I am, needless to say, not referring to "technological limitations" as Peter erroneously implies, but to economical limitations. As long as you can put your qubits together in one fridge it'll be fine. After that? We'll see. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-60311295080640107632021-02-09T09:44:40.751-05:002021-02-09T09:44:40.751-05:00This comment has been removed by the author.Jayhttps://www.blogger.com/profile/03001426991222495286noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-24977114367882206292021-02-09T09:38:18.436-05:002021-02-09T09:38:18.436-05:00This comment has been removed by the author.Jayhttps://www.blogger.com/profile/03001426991222495286noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-44991640020324328212021-02-09T08:11:28.807-05:002021-02-09T08:11:28.807-05:00Where's the quantum? The algorithm is designed...Where's the quantum? The algorithm is designed to run on a classical computer. Moziburhttps://www.blogger.com/profile/11836761141351221660noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8508662382926424522021-02-09T02:14:06.919-05:002021-02-09T02:14:06.919-05:00Einstein told the Pittsburgh Post-Gazette on Decem...Einstein told the Pittsburgh Post-Gazette on December 29, 1934: “There is not the slightest indication that nuclear energy will ever be obtainable. It would mean that the atom would have to be shattered at will.”Count Iblishttps://www.blogger.com/profile/17234653545597441999noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-13117432573908504122021-02-08T11:43:19.674-05:002021-02-08T11:43:19.674-05:00I loved this article. Keep doing the good work.
L...I loved this article. Keep doing the good work<a href="https://keralagoldrate.info/" rel="nofollow">.</a><br /> Love you..Adminhttps://www.blogger.com/profile/15700516465614269134noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69152106108772509562021-02-08T09:48:21.522-05:002021-02-08T09:48:21.522-05:00The funny think about quantum computers is they so...The funny think about quantum computers is they solve in effect linear algebra problems. If there is one thing we probably understand very well it is linear algebra. The theory of quantum states and operators in QM is linear algebra, but with a bit of complexity if the spectra is infinite. So we might well say that in isolation this part is fairly straight forwards.<br /><br />Where things get a Lawrence Crowellhttps://www.blogger.com/profile/12090839464038445335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-52282974160309315802021-02-08T04:23:21.534-05:002021-02-08T04:23:21.534-05:00For me, Ewin Tang's breakthrough is without do...For me, Ewin Tang's breakthrough is without doubt a success for quantum computing. The question for me is more the practical impact of that breakthrough (and similar other breakthroughs), and whether nuclear fusion had similar directly related breakthroughs (with practical impact?) that I just didn't notice.Jakitohttps://www.blogger.com/profile/08235089048981338795noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-39666418749629916912021-02-08T03:04:03.672-05:002021-02-08T03:04:03.672-05:00Ewin Tang's breakthrough, as far as Wikipedia ...Ewin Tang's breakthrough, as far as Wikipedia tells it, is to show that the exponential speedup of a certain quantum algorithm over a classical algorithm has a classical analalogue! That's not a breakthrough in quantum computing but a breakthrough of classical computing. Wikipedia even says she has 'dequantised' the algorithm. Personally, I think this adjective is a little Moziburhttps://www.blogger.com/profile/11836761141351221660noreply@blogger.com