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.
Original language | English (US) |
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Article number | 077002 |
Journal | Physical review letters |
Volume | 106 |
Issue number | 7 |
DOIs | |
State | Published - Feb 16 2011 |
ASJC Scopus subject areas
- Physics and Astronomy(all)