Quantum Computing with Majorana Kramers Pairs
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We propose a universal gate set acting on a qubit formed by the degenerate ground states of a Coulomb-blockaded time-reversal invariant topological superconductor island with spatially separated Majorana Kramers pairs: the “Majorana Kramers qubit.” All gate operations are implemented by coupling the Majorana Kramers pairs to conventional superconducting leads. Interestingly, in such an all-superconducting device, the energy gap of the leads provides another layer of protection from quasiparticle poisoning independent of the island charging energy. Moreover, the absence of strong magnetic fields—which typically reduce the superconducting gap size of the island—suggests a unique robustness of our qubit to quasiparticle poisoning due to thermal excitations. Consequently, the Majorana Kramers qubit should benefit from prolonged coherence times and may provide an alternative route to a Majorana-based quantum computer.
Originalsprog | Engelsk |
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Artikelnummer | 227002 |
Tidsskrift | Physical Review Letters |
Vol/bind | 129 |
Udgave nummer | 22 |
Antal sider | 6 |
ISSN | 0031-9007 |
DOI | |
Status | Udgivet - 23 nov. 2022 |
Bibliografisk note
Funding Information:
We would like to thank Jagadeesh S. Moodera for helpful discussions. C. S. was supported by the Swiss SNF under Project No. 174980. L. F. and C. S. were supported by DOE Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-SC0018945. L. F. was supported partly by the David and Lucile Packard Foundation.
Publisher Copyright:
© 2022 American Physical Society.
Links
- https://arxiv.org/pdf/1807.06620.pdf
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