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

  1. A. Kringhøj,
  2. B. van Heck,
  3. T. W. Larsen,
  4. O. Erlandsson,
  5. D. Sabonis,
  6. P. Krogstrup,
  7. L. Casparis,
  8. K. D. Petersson,
  9. and C. M. Marcus
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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