Preservation of Quantum Coherence for Gaussian-State Dynamics in a Non-Markovian Process

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 1-5
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/35/6/060301

摘要

Coherence is a key resource in quantum information science.Exactly understanding and controlling the variation of coherence are vital for implementation in realistic quantum systems.Using P-representation of density matrix,we obtain the analytical solution of the master equation for the classical states in the non-Markovian process and investigate the coherent dynamics of Gaussian states.It is found that quantum coherence can be preserved in such a process if the coupling strength between system and environment exceeds a threshold value.We also discuss the characteristic function of the Gaussian states in the non-Markovian process,which provides an inevitable bridge for the control and operation of quantum coherence.