Quasiparticle relaxation of superconducting qubits in the presence of flux

Abstract

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.

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

References in corpus (5)

• Charge insensitive qubit design derived from the Cooper pair box
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Controlling the spontaneous emission of a superconducting transmon qubit
• Quasiparticle decay rate of Josephson charge qubit oscillations
• Effect of Quasiparticles Injection on the AC Response of a Superconductor

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