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

Anders Kringhøj; Lucas Casparis; Michael Hell; Thorvald Wadum Larsen; Ferdinand Kuemmeth; Martin Christian Leijnse; Karsten Flensberg; Peter Krogstrup Jeppesen; Jesper Nygård; Karl David Petersson; Charles M. Marcus

doi:10.1103/physrevb.97.060508

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

Anders Kringhøj, Lucas Casparis, Michael Hell, Thorvald Wadum Larsen, Ferdinand Kuemmeth, Martin Christian Leijnse, Karsten Flensberg, Peter Krogstrup Jeppesen, Jesper Nygård, Karl David Petersson, Charles M. Marcus

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23 Citationer (Scopus)

Abstract

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.

Originalsprog	Engelsk
Artikelnummer	060508
Tidsskrift	Physical Review B
Vol/bind	97
Udgave nummer	6
Antal sider	5
ISSN	2469-9950
DOI	https://doi.org/10.1103/physrevb.97.060508
Status	Udgivet - 2018

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10.1103/physrevb.97.060508

PhysRevB.97.060508Forlagets udgivne version, 876 KB

https://arxiv.org/pdf/1703.05643.pdfLicens: Andet

Citationsformater

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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.

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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.

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ER -

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

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