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

Kringhøj, A.; Casparis, L.; Hell, M. LU ; Larsen, T. W.; Kuemmeth, F.; Leijnse, M. LU ; Flensberg, K.; Krogstrup, P.; Nygård, J. LU and Petersson, K. D., et al. (2018) In Physical Review B 97(6).
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.

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Contribution to journal
publication status
published
subject
in
Physical Review B
volume
97
issue
6
publisher
American Physical Society
external identifiers
  • scopus:85043783972
ISSN
2469-9950
DOI
10.1103/PhysRevB.97.060508
language
English
LU publication?
yes
id
a5a683fb-e5d0-47ac-b2dc-2ea2b196be54
date added to LUP
2018-03-27 14:08:29
date last changed
2018-10-03 12:07:32
@article{a5a683fb-e5d0-47ac-b2dc-2ea2b196be54,
  abstract     = {<p>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.</p>},
  articleno    = {060508},
  author       = {Kringhøj, A. and Casparis, L. and Hell, M. and Larsen, T. W. and Kuemmeth, F. and Leijnse, M. and Flensberg, K. and Krogstrup, P. and Nygård, J. and Petersson, K. D. and Marcus, C. M.},
  issn         = {2469-9950},
  language     = {eng},
  month        = {02},
  number       = {6},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Anharmonicity of a superconducting qubit with a few-mode Josephson junction},
  url          = {http://dx.doi.org/10.1103/PhysRevB.97.060508},
  volume       = {97},
  year         = {2018},
}