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Quantum Information Processing

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01-06-2016

Dynamical behavior of quantum correlations between two qubits coupled to an external environment

Authors: Jin-Long Wei, Xing-Li Li, Xi-Zheng Zhang, Jin-Liang Guo

Published in: Quantum Information Processing | Issue 6/2016

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Abstract

We investigate the dynamics of quantum correlations of a two-qubit system coupled to an external environment. We have considered both cases: a spin environment and a bosonic environment. In all cases, we have chosen the Bell-diagonal state as the initial state and computed the evolution of quantum correlations in terms of entanglement, quantum discord and trace distance geometric quantum discord. Special attention is paid to the singular quantum phenomena, such as entanglement sudden death, sudden transition and double sudden transitions from classical to quantum decoherence, which all depend on the initial state and the parameters related to the system and the environment. We find the trace distance geometric quantum discord has a good robustness in resisting the spin and bosonic environmental noise.

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Title: Dynamical behavior of quantum correlations between two qubits coupled to an external environment
Authors: Jin-Long Wei
Xing-Li Li
Xi-Zheng Zhang
Jin-Liang Guo
Publication date: 01-06-2016
Publisher: Springer US
Published in: Quantum Information Processing / Issue 6/2016
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-016-1277-0

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