Dephasing of Solid-State Qubits at Optimal Points
- 29 April 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 92 (17) , 178301
- https://doi.org/10.1103/physrevlett.92.178301
Abstract
Motivated by recent experiments with Josephson-junction circuits, we analyze the influence of various noise sources on the dynamics of two-level systems at optimal operation points where the linear coupling to low-frequency fluctuations is suppressed. We study the decoherence due to nonlinear (quadratic) coupling, focusing on the experimentally relevant and Ohmic noise power spectra. For noise strong higher-order effects influence the evolution.
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