Quasiparticle relaxation of superconducting qubits in the presence of flux

Details Quasiparticle relaxation of superconducting qubits in the presence of flux Quasiparticle relaxation of superconducting qubits in the presence of flux

2011-01-07

arxiv.org/abs/1101.1341v2

Phys. Rev. Lett. 106, 077002 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4.5 pages, 1 figure; minor changes to text & references, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.106.077002

Quasiparticle tunneling across a Josephson junction sets a limit for the lifetime of a superconducting qubit state. We develop a general theory of the corresponding decay rate in a qubit controlled by a magnetic flux. The flux affects quasiparticles tunneling amplitudes, thus making the decay rate flux-dependent. The theory is applicable for an arbitrary quasiparticle distribution. It provides estimates for the rates in practically important quantum circuits and also offers a new way of measuring the phase-dependent admittance of a Josephson junction.

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