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

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

22 Nov 2019arXiv:1911.10011links table onlyarchive 2025-07-28

A. Kringhøj, B. van Heck, T. W. Larsen, O. Erlandsson, D. Sabonis, P. Krogstrup, L. Casparis, K. D. Petersson, C. M. Marcus

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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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