Non-Markovian coherence dynamics of a driven spin-boson model: Damped quantum-beat or large-amplitude coherence oscillation

Journal Article · Fri Jun 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.062121· OSTI ID:20991085

Xiufeng, Cao; Hang, Zheng ^[1]

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1. Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China)

The dynamics of a driven spin-boson model is studied by means of the perturbation approach based on a unitary transformation. Analytical expressions for the population difference and the coherence of the two state system are obtained. The results show that for weak driving, the population difference displays damping coherent oscillation and/or damping quantum beat, depending on the initial preparation. The coherence exhibits damped oscillation with Rabi frequency. When driving is strong enough, the population difference exhibits undamped large-amplitude coherent oscillation. In addition, our theory leads to correct results in two limiting cases: without dissipation and without driving field.

• OSTI ID: 20991085
• Journal Information: Physical Review. A, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevA.75.062121; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSONS
DAMPING
DISTURBANCES
MARKOV PROCESS
OSCILLATIONS
PERTURBATION THEORY
SPIN
TRANSFORMATIONS