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Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon

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arxiv 1911.10011 v2 pith:GEEF4JYN submitted 2019-11-22 cond-mat.mes-hall quant-ph

A. Kringh{o}j , B. van Heck , T. W. Larsen , O. Erlandsson , D. Sabonis , P. Krogstrup , L. Casparis , K. D. Petersson
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C. M. Marcus
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classification cond-mat.mes-hallquant-ph
keywords dispersionchargejosephsonqubitresonancesingle-channeltransmonacross
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We demonstrate strong suppression of charge dispersion in a semiconductor-based transmon qubit across Josephson resonances associated with a quantum dot in the junction. On resonance, dispersion is drastically reduced compared to conventional transmons with corresponding Josephson and charging energies. We develop a model of qubit dispersion for a single-channel resonance, which is in quantitative agreement with experimental data.

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