Details: |
Characterizing correlations between different subsystems of a composite quantum system has been an important field of research in quantum information. This is due to the fact that quantum correlations, in the form of entanglement, is shown to be significantly more useful for performing communication and computational tasks over their classical counterparts. A main obstacle encountered in realizations of quantum information protocols is the rapid decay of quantum correlations with time in multiparty quantum systems exposed to environments. I will present scenarios involving physical systems that are realizable in the laboratory, and a specific model of environment, in which entanglement of the system, even when exposed to the environment, remains constant for a finite interval of time at the beginning of the dynamics. We call this phenomena as freezing of entanglement. I will also discuss necessary and sufficient conditions for freezing of other quantum correlation measures, when a two-qubit state with magnetization is subjected to local depolarizing channels. |