Intrinsic dissipation in superconducting junctions probed by qubit spectroscopy

Autor:	Golubev, Dmitry S., Galaktionov, Artem V., Zaikin, Andrei D.
Rok vydání:	2018
Předmět:	Condensed Matter - Superconductivity Quantum Physics
Zdroj:	Phys. Status Solidi RRL, 1800256 (2018)
Druh dokumentu:	Working Paper
DOI:	10.1002/pssr.201800256
Popis:	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. Comment: 7 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1810.00750 Zobrazit plný text záznamu View this record from Arxiv