Anharmonicity of a superconducting qubit with a few-mode Josephson junction
(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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- author
- organization
- publishing date
- 2018-02-21
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 97
- issue
- 6
- article number
- 060508
- 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
- 2023-11-17 16:20:53
@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>}}, 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}}, doi = {{10.1103/PhysRevB.97.060508}}, volume = {{97}}, year = {{2018}}, }