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

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

2006-12-19

arxiv.org/abs/cond-mat/0612473v2

Phys. Rev. B 75, 212501 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.75.212501

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.

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