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Superconducting Qubits

Intrinsic dissipation in superconducting junctions probed by qubit spectroscopy

arXiv
Authors: Dmitry S. Golubev, Artem V. Galaktionov, Andrei D. Zaikin

Year

2018

Paper ID

24316

Status

Preprint

Abstract Read

~2 min

Abstract Words

104

Citations

N/A

Abstract

We propose to study frequency dependent intrinsic dissipation in a highly transparent Josephson junction by means of qubit spectroscopy. The spectral density of the effective dissipative bath may contain significant contributions from Andreev bound states coupled to fluctuations of the Josephson phase. Varying either the bias current applied to the junction or magnetic flux through a superconducting ring in the rf-SQUID setup, one can tune the level splitting value close to the bottom of the Josephson potential well. Monitoring the qubit energy relaxation time one can probe the spectral density of the effective dissipative bath and unambiguously identify the contribution emerging from Andreev levels.

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  • We propose to study frequency dependent intrinsic dissipation in a highly transparent Josephson junction by means of qubit spectroscopy.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1810.00750 [2] arXiv https://arxiv.org/abs/1810.00750 [3] Publisher https://arxiv.org/abs/1810.00750

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