tag:blogger.com,1999:blog-13869903.post2084998119216233135..comments2024-03-28T04:15:44.459-05:00Comments on nanoscale views: What are steric interactions?Douglas Natelsonhttp://www.blogger.com/profile/13340091255404229559noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-13869903.post-55792568378440586312018-06-12T09:11:09.555-05:002018-06-12T09:11:09.555-05:00Thanks a lot for the link Doug - I hadn't seen...Thanks a lot for the link Doug - I hadn't seen this article.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13869903.post-89673579315187725322018-06-11T21:21:48.840-05:002018-06-11T21:21:48.840-05:00Hi Anon - Well, I'm no expert, but I think you...Hi Anon - Well, I'm no expert, but I think your skepticism is reasonable. From what I can tell, Intel is pursuing two QC approaches. On the one hand, they're making superconducting qubits of very much the same kind as google/John Martinis, and they've gotten up to about 50 of those on a chip, again similar to google's numbers. The article you link, which reads like it was machine-translated into English, is actually describing Intel's other approach, where they are making Si quantum dots (MOSFET-like structures, but very small, to hold single electrons), with the idea of using the spin of the charges in the dots as qubits. Integrated superconducting lines in this version control local dc magnetic fields and do electron spin resonance on the dots for qubit operations. This architecture is described here: https://arxiv.org/abs/1711.03807 . Since the Si quantum dots are based on Intel's CMOS processes, the dots themselves should be scalable to large numbers, though the remaining practical difficulties of decoherence, uniformity, and coupling qubits to each other are probably very significant. Douglas Natelsonhttps://www.blogger.com/profile/13340091255404229559noreply@blogger.comtag:blogger.com,1999:blog-13869903.post-56265365936694096422018-06-11T16:51:54.939-05:002018-06-11T16:51:54.939-05:00Hi Doug,
My comment is not really related to this...Hi Doug,<br /><br />My comment is not really related to this thread, but I was wondering if you could touch a word on this news story that Intel is making wafers full of qubits?<br /><br />https://www.techspot.com/news/75020-intel-now-capable-producing-full-silicon-wafers-quantum.html<br /><br />It is one thing to make billions of individual qubits by CMOS-industry standard, but another thing to build a real quantum computer out of them.<br /><br />Intel's Jim Clarke is a back-end interconnect person at Intel, so I'm not sure how much to trust his statements.<br /><br />What do the real experts on QC say?<br /><br />Thanks in advance!<br /><br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13869903.post-6073347118465522742018-06-08T17:54:05.106-05:002018-06-08T17:54:05.106-05:00Thank you - your notes and teaching resources look...Thank you - your notes and teaching resources look great! Douglas Natelsonhttps://www.blogger.com/profile/13340091255404229559noreply@blogger.comtag:blogger.com,1999:blog-13869903.post-10043725876525567582018-06-08T17:22:16.760-05:002018-06-08T17:22:16.760-05:00Very nice. Thanks.Very nice. Thanks.Dan Dllhttp://quantum.bu.edunoreply@blogger.com