Anharmonicity of a superconducting qubit with a few-mode Josephson junction

TY - JOUR

T1 - Anharmonicity of a superconducting qubit with a few-mode Josephson junction

AU - Kringhøj, Anders

AU - Casparis, Lucas

AU - Hell, Michael

AU - Larsen, Thorvald Wadum

AU - Kuemmeth, Ferdinand

AU - Leijnse, Martin Christian

AU - Flensberg, Karsten

AU - Krogstrup Jeppesen, Peter

AU - Nygård, Jesper

AU - Petersson, Karl David

AU - Marcus, Charles M.

N1 - [Qdev]

PY - 2018

Y1 - 2018

N2 - Coherent operation of gate-voltage-controlled hybrid transmon qubits (gatemons) based on semiconductor nanowires was recently demonstrated. Here we experimentally investigate the anharmonicity in epitaxial InAs-Al Josephson junctions, a key parameter for their use as a qubit. Anharmonicity is found to be reduced by roughly a factor of 2 compared to conventional metallic junctions and dependent on gate voltage. Experimental results are consistent with a theoretical model, indicating that Josephson coupling is mediated by a small number of highly transmitting modes in the semiconductor junction.

AB - Coherent operation of gate-voltage-controlled hybrid transmon qubits (gatemons) based on semiconductor nanowires was recently demonstrated. Here we experimentally investigate the anharmonicity in epitaxial InAs-Al Josephson junctions, a key parameter for their use as a qubit. Anharmonicity is found to be reduced by roughly a factor of 2 compared to conventional metallic junctions and dependent on gate voltage. Experimental results are consistent with a theoretical model, indicating that Josephson coupling is mediated by a small number of highly transmitting modes in the semiconductor junction.

U2 - 10.1103/physrevb.97.060508

DO - 10.1103/physrevb.97.060508

M3 - Journal article

AN - SCOPUS:85043783972

SN - 2469-9950

VL - 97

JO - Physical Review B

JF - Physical Review B

IS - 6

M1 - 060508

ER -