Parity-Protected Superconductor-Semiconductor Qubit
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Date
2020-07-31
Publication Type
Journal Article
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yes
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Abstract
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(2φ) 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. © 2020 American Physical Society.
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published
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Journal / series
Volume
125 (5)
Pages / Article No.
56801
Publisher
American Physical Society