Dephasing of Josephson qubits close to optimal points

Details Dephasing of Josephson qubits close to optimal points Dephasing of Josephson qubits close to optimal points

2005-12-29

arxiv.org/abs/cond-mat/0512701v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure, accepted for publication in JETP Lett

Scientific paper

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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