Entanglement and Quantum Discord Between Two Noninteracting Atoms

Xiang-Ping Liao, Jianshu Fang, Mao-Fa Fang +2 more

Tao Wu, L. Ye

Qing-Xia Mu, Ye-Qi Zhang, Jie Song

We investigate the dynamics of quantum correlations such as entanglement and quantum discord between two noninteracting atoms, each of which is trapped inside one of two coupled cavities. We find that the cavity decay can induce both entanglement and quantum discord between the two atoms when they are initially prepared in doubly excited state. The result shows the sudden death and sudden birth of entanglement and robustness of the quantum discord to sudden death. It is also found that the doubly excited state is responsible for the sudden death of entanglement. Moreover, the sudden death of entanglement can be controlled by the intercavity hopping rate.

F. F. Fanchini, Marcio F. Cornelio, M. C. de Oliveira +1 more

Qi-Liang He, Jing‐Bo Xu

We investigate the quantum discord dynamics of two noninteracting two-level atoms, each trapped in a single-mode optical cavity which is filled with a nonlinear Kerr-like medium. It is found that quantum discord vanishes only asymptotically although entanglement disappears suddenly during the time evolution. Furthermore, we explore the influence of the nonlinear Kerr-like medium on the dynamics of quantum discord, quantum mutual information, and classical correlation of two atoms. It is shown that the amount of quantum discord, quantum mutual information, and classical correlation of two atoms can be improved by adjusting the value of the Kerr medium. Finally, we also study the effect of phase dissipation on this system by making use of the Monte Carlo wavefunction method.

Alexander Streltsov, Hermann Kampermann, Dagmar Bruß