Decoherence induced by non-Markovian noise in a nonequilibrium environment

Abstract

We investigate theoretically the dynamical dephasing of a quantum system induced by non-Markovian noise in a nonequilibrium environment. We derive the closed equation of the dephasing factor for the quantum system under the nonstationary non-Markovian dichotomic noise environment. It is shown that the nonequilibrium feature of the environment gives rise to a time-dependent frequency shift and suppresses the dynamical dephasing of the quantum system and the environmental backaction of coherence. The memory effect of the environmental noise can reduce the dynamical dephasing of the quantum system and make the coherent backaction from the environment prominent. The non-Markovian feature of the environment, however, may not result in non-Markovian behavior in the dephasing dynamics of the quantum system.