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Canceled: Majorana Bound States in D-wave Superconductor-Based Hybrid Systems

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Chang Tsuei, IBM TJ Watson Research Center
08 April 2014 from 3:30 PM to 3:30 PM
339 Davey Laboratory
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Ever since Ettore Majorana predicted in 1937 a spin-half charge-neutral real particle that is alsoits own anti-particle, the pursuit of such fundamental particles has never stopped and so far without success. The recent discovery of topological insulators and topological superconductors has shifted the search for the elusive Majoana particles, in the form of Majorana bound states (MBS), to various condensed matter systems. Furthermore, recent theoretical studies have established that MBS can be encoded with information to enable the operation of non-Abelian quantum logic gates for error-tolerant quantum computation [1]. In this talk, we will show that the time-reversed doubly degenerate half flux quantum vortex (HQV) in a d-wave superconductor-based π-loop can be used for trapping Mjorana fermions. After inspecting a vast amount of published data of junctions that are close to what we have proposed, we were able to find: 1) angular resonant Andreev reflection and 2) quantized zero bias normalized differential conductance peak, as possible evidence for MBS formed at the junction interface [2]. Such heterostructures are topologically protected by a parity effect arising from an odd number of sign changes of the supercurrent circulating in the loop. The topological protection is further enhanced by the formation of the spin-orbit-coupling induced Majorana bound states at the Josephson junction interface in the π-loop. Latest developments in using a MBS-plus-HQV qubit platform for building a prototype topological quantum computer will be presented.

[1] C. W. J. Beenakker, Search for Majorana fermions in superconductors.

Annu. Rev. Cond. Mat. Phys. 4, 113-136 (2013). [2] C. C. Tsuei, arXiv:1306.0652v2