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arXiv · 1911.10011

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

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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Abstract

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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A. Kringhøj, B. van Heck, T. W. Larsen, O. Erlandsson, D. Sabonis, P. Krogstrup, L. Casparis, K. D. Petersson, C. M. Marcus. 2019-11-26. Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon. https://doi.org/10.1103/physrevlett.124.246803

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