Ying-Qi Lü, Jun-Hong An, Xi-Meng Chen, Hong-Gang Luo, C. H. Oh
Protecting quantum correlation from decoherence is one of the crucial issues in quantum information processing. It was commonly recognized that any initial quantum correlation of a composite system diminishes asymptotically or abruptly to zero under local Markovian decoherence. Here we show that, contrary to this recognition, a noticeable Gaussian quantum discord of a continuous-variable bipartite system can be frozen in the steady state in the non-Markovian dynamics if each of the subsystems forms a localized mode with its local reservoir. The condition for this quantum discord frozen can be reached by engineering appropriately the structure of the reservoirs. The possible realization of our results in coupled cavity array system formed by photonic crystal is proposed.
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http://arxiv.org/abs/1307.5385
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