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

doi:10.1103/PhysRevLett.124.246803

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

QRD/Kouwenhoven Lab

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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 language	English
Article number	246803
Number of pages	6
Journal	Physical Review Letters
Volume	124
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.124.246803
Publication status	Published - 2020

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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. ",

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AU - Van Heck, B.

AU - Larsen, T. W.

AU - Erlandsson, O.

AU - Sabonis, D.

AU - Krogstrup, P.

AU - Casparis, L.

AU - Petersson, K. D.

AU - Marcus, C. M.

PY - 2020

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AB - 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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DO - 10.1103/PhysRevLett.124.246803

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VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

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

Abstract

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