Effect of quantum fluctuations on even-odd energy difference in a Cooper-pair box

Abstract

We study the effect of quantum charge fluctuations on the even-odd energy difference for a small superconducting island (Cooper-pair box) connected to a large finite-size superconductor by a tunnel junction. Even-odd energy difference is important for understanding the quasiparticle "poisoning" effect, and determines the activation energy of a trapped quasiparticle in the Cooper-pair box. We find that renormalization of the activation energy due to quantum charge fluctuations depends on the dimensionless normal-state conductance of the junction g_T, and becomes strong at g_T >> 1.

4 pages, 2 figures

References in corpus (15)

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Cited by in corpus (7)

• Probing Majorana Physics in Quantum Dot Shot Noise Experiments
• Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
• 1 minute parity lifetime of a NbTiN Cooper-pair transistor
• Observation of 2e-periodic Supercurrents in Nanowire Single-Cooper-Pair Transistors
• The parity effect in Josephson junction arrays
• Dark Periods in Rabi Oscillations of Superconducting Phase Qubit Coupled to a Microscopic Two-Level System
• Charge sensitivity of a cavity-embedded Cooper pair transistor limited by single-photon shot noise