Phase-dependent quasiparticle tunneling in Josephson junctions: Measuring the cos-phi term with a superconducting charge qubit

Abstract

We investigate quasiparticle tunneling in a Cooper-pair box which is embedded in a superconducting ring to allow control of the total phase difference across the island. The phase affects the transition rate between different electron number parity states of the island, which can be observed in experiment by established means. The phase dependence also leads to what is known as the cos-phi term in the tunneling characteristics of classical Josephson junctions. This effect has remained controversial for decades; the proposed scheme opens an independent way to probe it.

5 pages, 3 figures

References in corpus (4)

• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
• Energy decay and frequency shift of a superconducting qubit from non-equilibrium quasiparticles
• Kinetics of quasiparticle trapping in a Cooper-pair box

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• The effect of environmental coupling on tunneling of quasiparticles in Josephson junctions
• Dephasing due to quasiparticle tunneling in fluxonium qubits: a phenomenological approach
• Diagrammatic description of a system coupled strongly to a bosonic bath
• Effects of quasiparticle tunneling in a circuit-QED realization of a strongly driven two-level system
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• Phase-dependent damping rate of Josephson plasmons in the nonequilibrium steady state