Decoherence and Relaxation of a Quantum Bit in the Presence of Rabi Oscillations

Details Decoherence and Relaxation of a Quantum Bit in the Presence of Rabi Oscillations Decoherence and Relaxation of a Quantum Bit in the Presence of Rabi Oscillations

2002-09-09

arxiv.org/abs/cond-mat/0209217v4

Phys.Rev. B 67, 155104 (2003)

Physics

Condensed Matter

14 pages; misprints corrected

Scientific paper

10.1103/PhysRevB.67.155104

Dissipative dynamics of a quantum bit driven by a strong resonant field and interacting with a heat bath is investigated. We derive generalized Bloch equations and find modifications of the qubit's damping rates caused by Rabi oscillations. Nonequilibrium decoherence of a phase qubit inductively coupled to a LC-circuit is considered as an illustration of the general results. It is argued that recent experimental results give a clear evidence of effective suppression of decoherence in a strongly driven flux qubit.

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