Environmental coherence and excitation effects in non-Markovian dynamics

Abstract

We study the non-Markovian dynamics of a qubit system coupled respectively to coherent state, squeezing vacuum state, and mixed state environments through dephasing interaction. Special attention is paid to the problem of environmental coherence and excitation on the effect of non-Markovianity of system dynamics. Some nontrivial and unexpected results are found. The number of environmental excitations serves to enhance the non-Markovianity of system dynamics, but the enhancement slows down with the increasing of the variance of excitation number. However, environmental coherence can play dual effects, which enhances in some cases and suppresses in other cases the non-Markovianity of system dynamics.

Non-Markovian dynamics and quantum interference in open three-level quantum systems

“…Quantum non-Markovian dynamics can lead to some interesting phenomena such as quantum correlation and coherence trapping [9][10][11], correlation quantum beat [12], and has extensively possible applications in quantum metrology [13], quantum communication [14][15][16][17], quantum control [18]. Because of these distinctive properties and extensive applications, more and more attention and interest have been devoted to the study of non-Markovian process of open systems, * Electronic address: hszeng@hunnu.edu.cn including the measure of non-Markovianity [19][20][21][22][23][24][25][26][27][28][29][30][31][32], the positivity [33][34][35], and some other dynamical properties [36][37][38][39][40][41][42][43][44] and approaches [45][46][47] of non-Markovian processes. Experimentally, the simulation [48][49][50][51][52][53] of non-M...…”

Dynamical control of population and entanglement for open Λ-type atoms by engineering the environment

“…Many relevant physical systems, such as the quantum optical system, [3] the nanoscale solid-state quantum system, [4,5] quantum chemistry, [6] and the excitation transfer in the biological system, [7] should be treated by quantum non-Markovian processes. Recently, quantum non-Markovian processes have been studied extensively, from the measure of non-Markovianity of the processes [8][9][10][11][12][13][14][15][16][17][18] to the properties [19][20][21][22][23][24][25][26][27][28][29] and applications [30][31][32][33][34][35][36][37] of the dynamical processes.…”