2005/12/29 by Sergey Syzranov, Yu. Makhlin, Syzranov, S. V. +1
Physics and Astronomy · Computer Science · #Quantum and electron transport phenomena #Quantum Information and Cryptography #Atomic and Subatomic Physics Research
paper · pdf · doi:10.48550/arxiv.cond-mat/0512701
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.