Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
- A. Kringhøj ,
- Bernard van Heck ,
- Thorvald Wadum Larsen ,
- O. Erlandsson ,
- D. Sabonis ,
- Peter Krogstrup ,
- Lucas Casparis ,
- Karl Petersson ,
- Charles Marcus
Physical Review Letters | , Vol 124(24): pp. 246803
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.