Abstract
We investigate the dynamics and protection of quantum correlations of a qubit–qutrit system under local amplitude damping channels with finite temperature. The comparison between entanglement and geometric measure of quantum discord (GMQD) is analyzed. It is found that the GMQD is more robust than the entanglement against the decoherence induced by the channels. Special attention is paid to how to protect the quantum correlations from decoherence by weak measurement and measurement reversal. We find that the weak measurement is not necessary when the initial state is maximally entangled. But for other initial states, a successful protection of quantum correlations requires combined weak measurement and measurement reversal. Under certain conditions, we also notice that we can realize the protection at finite temperature for GMQD, but not for entanglement.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China Grant Nos. 11305114 and 11304226, as well as by the National Natural Science Foundation of Hebei Province of China under Grant No. A2012202028 and Natural Science Foundation of Tianjin Normal University of China under Grant No. 5RL113.
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Guo, JL., Wei, JL. & Qin, W. Enhancement of quantum correlations in qubit–qutrit system under decoherence of finite temperature. Quantum Inf Process 14, 1399–1410 (2015). https://doi.org/10.1007/s11128-015-0939-7
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DOI: https://doi.org/10.1007/s11128-015-0939-7