Eur. Phys. J. D (2014) 68: 335
https://doi.org/10.1140/epjd/e2014-50478-6

Regular Article

Non-Markovianity for a qubit system driven by a classical phase noisy laser

¹ Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, P.R. China
² Physical and Photoelectric Science Department, Guangdong Ocean University, Zhanjiang 524088, P.R. China

^a e-mail: mffang@hunnu.edu.cn

Received: 27 June 2014
Received in final form: 14 August 2014
Published online: 4 November 2014

Abstract

In this paper, the degree of non-Markovian behaviour for a qubit system driven by a classical phase noisy laser (CPNL) is investigated. We analyse the dynamics of the rate of change of the trace distance in two different dynamical regimes in relation to the values of the system parmeters. The results show that the behaviour of the non-Markovianity depends on the ratio of the CPNL rate and the system-environment coupling strength. In the non-Markovian classical noise region, the non-Markovian character becomes less evident when the ratio of the CPNL rate and the system-environment coupling increases.