Parity-Protected Superconductor-Semiconductor Qubit
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Parity-Protected Superconductor-Semiconductor Qubit. / Larsen, T. W.; Gershenson, M. E.; Casparis, L.; Kringhj, A.; Pearson, N. J.; McNeil, R. P. G.; Kuemmeth, F.; Krogstrup, P.; Petersson, K. D.; Marcus, C. M.
In: Physical Review Letters, Vol. 125, No. 5, 056801, 30.07.2020.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Parity-Protected Superconductor-Semiconductor Qubit
AU - Larsen, T. W.
AU - Gershenson, M. E.
AU - Casparis, L.
AU - Kringhj, A.
AU - Pearson, N. J.
AU - McNeil, R. P. G.
AU - Kuemmeth, F.
AU - Krogstrup, P.
AU - Petersson, K. D.
AU - Marcus, C. M.
PY - 2020/7/30
Y1 - 2020/7/30
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.125.056801
DO - 10.1103/PhysRevLett.125.056801
M3 - Journal article
C2 - 32794832
VL - 125
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 5
M1 - 056801
ER -
ID: 246780043