Quantum phase slips in a resonant Josephson junction
Tereza Vakhtel, Bernard van Heck
DOI 10.1103/PhysRevB.107.195405 · Physical Review B
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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 2π phase slips. As a consequence, close to resonance, 4π 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.
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