Coherence-selective non-Markovian qubit dynamics

Naghi Behzadi, Bahram Ahansaz, Esfandyar Faizi

Cristian E. Susa, John Henry Reina

Coherence and entanglement in non-Markovian dynamics of qubits

Jun Ying Sun, Yong-Nan Sun, Chuan‐Feng Li +3 more

Zhongxiao Wang, Teng Ma, Shuhao Wang +2 more

The behavior of quantum coherence is studied under Markovian and non-Markovian dynamics for open quantum systems. For single qubit systems, we show that the coherence depending on the off-diagonal elements of the density matrix is the upper bound of the coherence depending on the relative entropy under both Markovian and non-Markovian processes. For two-qubit systems, in both Markovian and non-Markovian processes, quantum discord and coherence show less sensitivity to the initial state than quantum entanglement. We also find that the quantum discord has similar behaviors with coherence under both Markovian and non-Markovian dynamics.

Ning Tang, Wen Cheng, Hao‐Sheng Zeng

Ying Liu, Wen Cheng, Ze-Yu Gao +1 more

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.