Dephasing of solid-state qubits at optimal points.
作者： Yuriy Makhlin , Alexander Shnirman
DOI: 10.1103/PHYSREVLETT.92.178301
关键词: Dephasing 、 Noise power 、 Physics 、 Quadratic equation 、 Nonlinear system 、 Coupling 、 Qubit 、 Quantum mechanics 、 Noise (electronics) 、 Quantum decoherence
摘要: Motivated by recent experiments with Josephson-junction circuits, we analyze the influence of various noise sources on dynamics two-level systems at optimal operation points where linear coupling to low-frequency fluctuations is suppressed. We study decoherence due nonlinear (quadratic) coupling, focusing experimentally relevant $1/f$ and Ohmic power spectra. For strong higher-order effects evolution.
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