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VOLUME 83 | ISSUE 2 | PAGE 93
Dephasing of Josephson qubits close to optimal points
S. V. Syzranov+*, Yu. Makhlin+

+Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
*Moscow Institute of Physics and Technology, 141700 Dolgoprudniy, Moscow Reg., Russia


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.


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