Physics – Quantum Physics
Scientific paper
2004-01-08
Phys. Rev. A 69, 062110 (2004)
Physics
Quantum Physics
submitted to PRA
Scientific paper
10.1103/PhysRevA.69.062110
When a quantum nonlinear system is linearly coupled to an infinite bath of harmonic oscillators, quantum coherence of the system is lost on a decoherence time-scale $\tau_D$. Nevertheless, quantum effects for observables may still survive environment-induced decoherence, and be observed for times much larger than the decoherence time-scale. In particular, we show that the Ehrenfest time, which characterizes a departure of quantum dynamics for observables from the corresponding classical dynamics, can be observed for a quasi-classical nonlinear oscillator for times $\tau \gg\tau_D$. We discuss this observation in relation to recent experiments on quantum nonlinear systems in the quasi-classical region of parameters.
Berman Gennady P.
Bishop Alan R.
Borgonovi Fausto
Dalvit Diego A. R.
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