Interplay between entanglement and entropy in two-qubit systems



: Mazzola L, Maniscalco S, Piilo J, Suominen KA

Publisher: IOP PUBLISHING LTD

: 2010

: Journal of Physics B: Atomic, Molecular and Optical Physics

: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

: J PHYS B-AT MOL OPT

: ARTN 085505

: 8

: 43

: 8

: 10

: 0953-4075

DOI: https://doi.org/10.1088/0953-4075/43/8/085505

: https://arxiv.org/abs/0904.2857


We study the exact entanglement and entropy dynamics of two qubits interacting with a common zero-temperature non-Markovian reservoir. It is a commonly held view that entanglement loss due to environmental decoherence is accompanied by loss of purity of the state of the system. We demonstrate that such an intuitive picture does not always apply: the deterioration of entanglement and purity does not necessarily come together; i.e. revivals of entanglement can be accompanied by deterioration of purity. To complete our investigation on entanglement-mixedness interplay we consider the case of initial mixed states and study how the entanglement dynamics and its revivals are related to both the initial purity and the initial entanglement.



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