Sudden death and revival qubits coupled collectively of entanglement of two to a thermal reservoir

C. V. Namitha, K. G. Paulson, S. V. M. Satyanarayana

Wen Zhang Li, Li Tuo Shen

Jian Li, Khattiya Chalapat, Gheorghe Sorin Paraoanu

Xiang-Ping Liao, Jianshu Fang, Mao-Fa Fang

In this paper, we investigate the entanglement of two qubits coupled collectively to a common thermal environment and find that the the collective decay can lead to a revival of the entanglement that has already been destroyed. We also show that the ability of the system to revival entanglement relies on the mean photon number of the thermal environment and the degree of entanglement of the initial state.

Mahmood Irtiza Hussain, Rabia Tahira, Manzoor Ikram

Lian-Ao Wu, Claire X. Yu, Dvira Segal

We demonstrate an exact mapping of a class of models of two interacting qubits in thermal reservoirs to two separate problems of spin–boson-type systems. Based on this mapping, exact numerical simulations of the qubits dynamics can be performed, beyond the weak system–bath coupling limit and the Markovian approximation. Given the time evolution of the system population and coherences, we study as an application the dynamics of entanglement between the pair of qubits immersed in boson thermal baths, showing a rich phenomenology, including an intermediate oscillatory behavior, the entanglement sudden birth, sudden death and revival. We find that the occurrence of entanglement sudden death in this model depends on the portion of the zero and double excitation states in the subsystem initial state. In the long-time limit, analytic expressions are presented at weak system–bath coupling, for a range of relevant qubit parameters.