Quantum coherence and correlation dynamics of two-qubit system in spin bath environment

• 来源期刊: 中国物理B（英文版）
• 关键词: quantum coherence quantum correlation spin bath
• 年，卷（期）: 2020,（4）
• 页码范围: 173-179
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab773e

摘要

The quantum entanglement, discord, and coherence dynamics of two spins in the model of a spin coupled to a spin bath through an intermediate spin are studied. The effects of the important physical parameters including the coupling strength of two spins, the interaction strength between the intermediate spin and the spin bath, the number of bath spins and the temperature of the system on quantum coherence and correlation dynamics are discussed in different cases. The frozen quantum discord can be observed whereas coherence does not when the initial state is the Bell-diagonal state. At finite temperature, we find that coherence is more robust than quantum discord, which is better than entanglement, in terms of resisting the infl uence of environment. Therefore, quantum coherence is more tenacious than quantum correlation as an important resource.