Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.077002
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Funding
- IARPA (ARO) [W911NF-09-1-0369]
- NSF (DMR) [0906498]
- Yale University
- CNR-Istituto di Cibernetica
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906498] Funding Source: National Science Foundation
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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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