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.

Original languageEnglish
Article number246803
Number of pages6
JournalPhysical Review Letters
Volume124
Issue number24
DOIs
Publication statusPublished - 2020

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    Kringhøj, A., Van Heck, B., Larsen, T. W., Erlandsson, O., Sabonis, D., Krogstrup, P., Casparis, L., Petersson, K. D., & Marcus, C. M. (2020). Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon. Physical Review Letters, 124(24), [246803]. https://doi.org/10.1103/PhysRevLett.124.246803