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A Parity-Protected Superconductor-Semiconductor Qubit
- Source :
- Phys. Rev. Lett. 125, 056801 (2020)
- Publication Year :
- 2020
-
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(2{\phi}) 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.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 125, 056801 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2004.03975
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.125.056801