Energy relaxation of superconducting charge qubit via Andreev processes

Details Energy relaxation of superconducting charge qubit via Andreev processes Energy relaxation of superconducting charge qubit via Andreev processes

2007-06-04

arxiv.org/abs/0706.0522v2

Phys. Rev. B 76, 104507 (2007)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures (accepted to Phys. Rev. B)

Scientific paper

10.1103/PhysRevB.76.104507

We study fundamental limitations on the energy relaxation rate of a superconducting charge qubit with a large-gap Cooper-pair box, $\Delta_b > \Delta_r$. At a sufficiently large mismatch between the gap energies in the box $\Delta_b$ and in the reservoir $\Delta_r$,"quasiparticle poisoning" becomes ineffective even in the presence of nonequilibrium quasiparticles in the reservoir. The qubit relaxation still may occur due to higher-order (Andreev) processes. In this paper we evaluate the qubit energy relaxation rate due to Andreev processes.

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