Here is a paper by the same authors that appears to address this physics. It is not the science magazine article, but it covers the same material. It is an experimental paper. As a topological superconductor that is defined on edge states on the boundary it appears this is a 2-dimensional surface and there is a mixture between anyonic statistics and fermionic Cooper pairing of electrons with opposite momenta. This has some theoretical implications. The authors talk of nonabelian stats, which I think refer to anyons, and the nonabelian aspects may be with this quantum blurring of anyonic and superconductive physics.
https://arxiv.org/pdf/1908.07396.pdf LC On Wednesday, August 21, 2019 at 5:56:22 PM UTC-5, John Clark wrote: > > In my opinion a scalable quantum computer could bring about a singularity > in human affairs as surely as Drexler's nanotechnology, and the most > promising way of achieving this is through a fault tolerant topological > quantum computer. In the current issue of the journal Science (August 16 > 2019) a revolutionary new type of superconductor has been discovered, > uranium ditelluride (UTe2), that may turn out to have some considerable > bearing on this. Nick Butch, from the National Institute of Standards and > one of the authors of the paper says: > > *"This is potentially the silicon of the quantum information age. You > could use uranium ditelluride to build the qubits of an efficient quantum > computer."* > > ferromagnetic spin-triplet superconductivity > <https://science.sciencemag.org/content/365/6454/684> > > Uranium Ditelluride is a very unusual superconductor for several reasons: > > 1) It is a topological superconductor, meaning that the interior is a > insulator but the surface is a superconductor. > 2) It can tolerate enormously strong magnetic fields, much higher than > other superconductors. > 3) Most superconductors are spin singlet, this means that the spins in the > electrons in the Cooper Pairs, which carry the electrical current in all > superconductors, are lined up in a antiparallel direction; but Uranium > Ditelluride is spin triplet, their electron spins are perpendicular. > > All this adds up to the surface of uranium ditelluride being the ideal > stage set to produce logic gates made of Majorana pseudoparticles that > obey non-Abelian statistics. And that means you could store quantum > information topologically which would make it very resistant to quantum > decoherence for the same reason you're unlikely to be able to untie a knot > by just bumping it, you might change its shape but not its topological > properties. And quantum decoherence is by far the most important > obstacle we must overcome if we want to build a scalable quantum computer. > > And that is not the only new development in the last few weeks, Javad > Shaban and his team found something similar in Indium arsenide (InAs) > although you must get it much colder before it becomes superconducting, > .007 Kelvin verses 1.6 Kelvin for Uranium ditelluride. > > Phase signature of topological transition in Josephson Junctions > <https://arxiv.org/pdf/1906.01179.pdf> > > Dr. Shabani said: > *"We see value in these particles because of their potential to store > quantum information in a special computation space where quantum > information is protected from the environment noise. As a result, we have > sought to engineer platforms on which these calculations could be > conducted. The new discovery of topological superconductivity in a > two-dimensional platform paves the way for building scalable topological > qubits to not only store quantum information, but also to manipulate the > quantum states that are free of error. These findings strongly supports the > emergence of a topological phase in the system. This offers a scalable > platform for detection and manipulation of Majorana bounds states for > development of complex circuits for fault-tolerant topological quantum > computing."* > > By the way, the leading company in all this is none other than Microsoft. > > John K Clark > > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/9d366c8f-9222-4f3c-8cce-81ec23569ad0%40googlegroups.com.
