Dephasing of Solid-State Qubits at Optimal Points
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 1/f and Ohmic noise power spectra. For 1/f noise strong higher-order effects influence the evolution.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2004
- DOI:
- arXiv:
- arXiv:cond-mat/0308297
- Bibcode:
- 2004PhRvL..92q8301M
- Keywords:
-
- 85.25.Cp;
- 03.65.Yz;
- 75.10.Jm;
- Josephson devices;
- Decoherence;
- open systems;
- quantum statistical methods;
- Quantized spin models;
- Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- minor corrections and clarifications