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Quantum Computing with Majorana Kramers Pairs
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-23 , DOI: 10.1103/physrevlett.129.227002
Constantin Schrade 1, 2 , Liang Fu 1
Affiliation  

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.

中文翻译:

使用 Majorana Kramers 对进行量子计算

我们提出了一个通用门集,作用于由具有空间分离的 Majorana Kramers 对的库仑阻塞时间反转不变拓扑超导体岛的退化基态形成的量子位:“Majorana Kramers 量子位”。所有门操作都是通过将 Majorana Kramers 对耦合到传统的超导引线来实现的。有趣的是,在这样的全超导装置中,引线的能隙提供了另一层保护,防止准粒子中毒,与岛充电能量无关。此外,强磁场的缺失——通常会减小岛的超导间隙尺寸——表明我们的量子位对热激发引起的准粒子中毒具有独特的鲁棒性。最后,
更新日期:2022-11-23
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