We investigate the sudden birth and sudden death of entanglement of two qubits interacting with uncorrelated structured reservoirs. The system is initially prepared in two-qubit extended Werner-like state. We work out...We investigate the sudden birth and sudden death of entanglement of two qubits interacting with uncorrelated structured reservoirs. The system is initially prepared in two-qubit extended Werner-like state. We work out the dependence of the entanglement dynamics on both non-Markovian environments and the purity of initial state, and show that non-Markovian environments and the purity can control the time of the two-qubit entanglement sudden death and the reservoirs＇ entanglement sudden birth. Furthermore, under the conditions of different purity and initial entangIement, the revival of qubits＇ entanglement can manifest before, simultaneously or even after the disentanglement of their corresponding reservoirs.展开更多
We investigate entanglement dynamics of three independent qubits each locally interacting with a zero-temperature non-Markovian reservoir.The effects of environment's amount of non-Markovianity or parameters in in...We investigate entanglement dynamics of three independent qubits each locally interacting with a zero-temperature non-Markovian reservoir.The effects of environment's amount of non-Markovianity or parameters in initialstates on the three-qubit entanglement dynamics are presented in detail.It is found that the entanglement of such asystem revives after a finite dark period when a proper degree of non-Markovian is present.A deep comparison to thatin two-qubit system is also made.展开更多
The effect of stochastic dephasing on the dynamics of entanglement of qutrit-qutrit states is investigated by using negativity and bound entanglement defined with realignment criterion, From the analysis, we, find tha...The effect of stochastic dephasing on the dynamics of entanglement of qutrit-qutrit states is investigated by using negativity and bound entanglement defined with realignment criterion, From the analysis, we, find that the time evolution of quantum free entanglement and bound entanglement depends on the fluctuations of the stochastic variables and the parameters of the particular initial states of concern. Our results imply that some qutrits states display both distillability sudden death and entanglement sudden death, while some states do not display distillability sudden death but only entanglement sudden death.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.10904033Natural Science Foundation of Hubei Province under Grant No.2009CDA145+1 种基金Educational Commission of Hubei Province under Grant No.D20092204the Postgraduate Programme of Hubei Normal University under Grant No.2007D20
文摘We investigate the sudden birth and sudden death of entanglement of two qubits interacting with uncorrelated structured reservoirs. The system is initially prepared in two-qubit extended Werner-like state. We work out the dependence of the entanglement dynamics on both non-Markovian environments and the purity of initial state, and show that non-Markovian environments and the purity can control the time of the two-qubit entanglement sudden death and the reservoirs＇ entanglement sudden birth. Furthermore, under the conditions of different purity and initial entangIement, the revival of qubits＇ entanglement can manifest before, simultaneously or even after the disentanglement of their corresponding reservoirs.
基金supported by National Natural Science Foundation of China under Grant No.60573008
文摘We investigate entanglement dynamics of three independent qubits each locally interacting with a zero-temperature non-Markovian reservoir.The effects of environment's amount of non-Markovianity or parameters in initialstates on the three-qubit entanglement dynamics are presented in detail.It is found that the entanglement of such asystem revives after a finite dark period when a proper degree of non-Markovian is present.A deep comparison to thatin two-qubit system is also made.
基金Supported by the National Natural Science Foundation of China under Grant Nos. 10947115, 10975125, and 11004001
文摘The effect of stochastic dephasing on the dynamics of entanglement of qutrit-qutrit states is investigated by using negativity and bound entanglement defined with realignment criterion, From the analysis, we, find that the time evolution of quantum free entanglement and bound entanglement depends on the fluctuations of the stochastic variables and the parameters of the particular initial states of concern. Our results imply that some qutrits states display both distillability sudden death and entanglement sudden death, while some states do not display distillability sudden death but only entanglement sudden death.
