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- Title
Intrinsic Dissipation in Superconducting Junctions Probed by Qubit Spectroscopy.
- Authors
Golubev, Dmitry S.; Galaktionov, Artem V.; Zaikin, Andrei D.
- Abstract
The study of frequency‐dependent intrinsic dissipation in a highly transparent Josephson junction by means of quantum‐bit (qubit) spectroscopy is proposed. 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 radiofrequency superconducting quantum interference device (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. The authors propose to study intrinsic dissipation, caused by coupling between Andreev levels and Josephson phase in a highly transparent Josephson junction, by means of qubit spectroscopy. Varying the bias current or flux, one can tune transition rates between the energy levels in the Josephson potential well. The rates can be determined by spectroscopy, and reveal the spectrum of Andreev levels.
- Subjects
SUPERCONDUCTORS; JOSEPHSON junctions; ENERGY dissipation; QUBITS; SPECTRAL energy distribution; SUPERCONDUCTING quantum interference devices
- Publication
Physica Status Solidi - Rapid Research Letters, 2019, Vol 13, Issue 1, pN.PAG
- ISSN
1862-6254
- Publication type
Article
- DOI
10.1002/pssr.201800256