We investigate the consequences of resonant tunneling of Cooper pairs on the quantum phase slips occurring in a Josephson junction. The amplitude for quantum tunneling under the Josephson potential barrier is modified by the Landau-Zener amplitude of adiabatic passage through an Andreev level crossing, resulting in the suppression of 27r phase slips. As a consequence, close to resonance, 47r phase slips become the dominant tunneling process. We illustrate this crossover by determining the energy spectrum of a transmon circuit, showing that a residual charge dispersion persists even at perfect transparency.
Quantum phase slips in a resonant Josephson junction / Vakhtel, Tereza; VAN HECK, Bernard. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 107:19(2023). [10.1103/physrevb.107.195405]
Quantum phase slips in a resonant Josephson junction
Bernard van HeckUltimo
2023
Abstract
We investigate the consequences of resonant tunneling of Cooper pairs on the quantum phase slips occurring in a Josephson junction. The amplitude for quantum tunneling under the Josephson potential barrier is modified by the Landau-Zener amplitude of adiabatic passage through an Andreev level crossing, resulting in the suppression of 27r phase slips. As a consequence, close to resonance, 47r phase slips become the dominant tunneling process. We illustrate this crossover by determining the energy spectrum of a transmon circuit, showing that a residual charge dispersion persists even at perfect transparency.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.