Parity-Protected Superconductor-Semiconductor Qubit.,Physical Review Letters

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Parity-Protected Superconductor-Semiconductor Qubit.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-30 , DOI: 10.1103/physrevlett.125.056801
T W Larsen ₁ , M E Gershenson ₂ , L Casparis ₁ , A Kringhøj ₁ , N J Pearson _{1,

3} , R P G McNeil ₁ , F Kuemmeth ₁ , P Krogstrup _{1,

4} , K D Petersson ₁ , C M Marcus ₁

Affiliation

Coherence of superconducting qubits can be improved by implementing designs that protect the parity of Cooper pairs on superconducting islands. Here, we introduce a parity-protected qubit based on voltage-controlled semiconductor nanowire Josephson junctions, taking advantage of the higher harmonic content in the energy-phase relation of few-channel junctions. A symmetric interferometer formed by two such junctions, gate-tuned into balance and frustrated by a half-quantum of applied flux, yields a

\cos (2 φ)

Josephson element, reflecting coherent transport of pairs of Cooper pairs. We demonstrate that relaxation of the qubit can be suppressed tenfold by tuning into the protected regime.

中文翻译：

受奇偶校验保护的超导体-半导体量子位。

通过实施保护超导岛上库珀对奇偶校验的设计，可以提高超导量子位的相干性。在这里，我们介绍了一种基于压控半导体纳米线约瑟夫森结的奇偶校验保护量子比特，它利用了少数通道结的能量-相位关系中的较高谐波含量。由两个这样的结形成的对称干涉仪，经过栅极调谐达到平衡，并受到所施加通量的半量子的干扰，产生了一个