Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
A. Kringhøj (University of Copenhagen)
B. van Heck (University of California, Microsoft Quantum Lab Delft, TU Delft - QRD/Kouwenhoven Lab)
T. W. Larsen (University of Copenhagen)
Oscar Erlandsson (University of Copenhagen)
Deividas Sabonis (University of Copenhagen)
Peter Krogstrup (University of Copenhagen)
L. Casparis (University of Copenhagen)
K. D. Petersson (University of Copenhagen)
C. M. Marcus (University of Copenhagen)
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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.