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

Journal article (2020)

Authors

A. Kringhøj University of Copenhagen
B. van Heck University of California, Microsoft Quantum Lab Delft, QRD/Kouwenhoven Lab - QuTech Advanced Research Centre
T. W. Larsen University of Copenhagen
O. Erlandsson University of Copenhagen
D. 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
Research Group
QRD/Kouwenhoven Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2020 A. Kringhøj, B. van Heck, T. W. Larsen, O. Erlandsson, D. Sabonis, P. Krogstrup, L. Casparis, K. D. Petersson, C. M. Marcus
DOI: https://doi.org/10.1103/PhysRevLett.124.246803
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Published Date

2020

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Qubit Research Division

Research Group

QRD/Kouwenhoven Lab

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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