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 m...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 T1 (determining that the quantum state is entangled or separable) and T2 (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.展开更多
基金The project supported by the Natural Science Foundation of the Education Department of Anhui Province of China under Grant No. 2006kj070A, and 2006KJ057B and the Talent Foundation of Anhui University
基金Supported by the National Natural Science Foundation of China under Grant Nos 11004065 and 11105049Educational Com-mission of Hubei Province under Grant Nos Q20112501 and 2010C20.
文摘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 T1 (determining that the quantum state is entangled or separable) and T2 (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.
