Anomalous Temperature Effects of the Entanglement of Two Coupled Qubits in Independent Environments

作者：Shan Chuan-Jia^*; Cao Shuai; Xue Zheng-Yuan; Zhu Shi-Liang

来源：Chinese Physics Letters, 2012, 29(4): 040301.

DOI：10.1088/0256-307X/29/4/040301

• ANTIFERROMAGNETIC SPIN CHAINS
• QUANTUM SIMULATION
• SUDDEN-DEATH
• STATE

We investigate the entanglement dynamical behavior of two coupled qubits via a Heisenberg XX interaction, which are connected with two independent finite temperature heat baths. By numerical simulations of the quantum master equation, it is found that the interesting phenomena of entanglement sudden death (ESD) as well as sudden birth (ESB) appear during the evolution process for particular initial states. We also show that two critical temperatures T-1 (determining that the quantum state is entangled or separable) and T-2 (where maximal stationary entanglement can be observed) exist, and stationary entanglement exhibits a non-monotonic behavior as a function of the finite temperature noise strength. These results enlarge the domain of the reasonable experimental temperature where stationary entanglement can be observable.

• 单位
  华南师范大学; 湖北师范大学