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VOLUME 83 (2006) | ISSUE 2 | PAGE 93
Dephasing of Josephson qubits close to optimal points
PACS: 03.65.Yz, 03.67.Pp
Abstract
Decoherence of Josephson qubits can be substantially reduced by tuning their parameters to optimal operation points, with only quadratic coupling to fluctuations. We analyze dephasing due to 1/f noise for a two-level system, detuned from an optimal point, i.e., the crossover to the linear-coupling regime, both for free induction decay and for spin-echo experiments. Influence of several noise sources is also discussed.