Dynamics of quantum discord in photonic crystals

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• 作者：Jing Wang ; Han Zhang ; Yan Zhang ; Lei Zhang ; Tianhao Huang ; Shengnan Sun ; Han-Zhuang Zhang ; ^{zhuangzhang@yahoo.cn}
• 关键词：Quantum discord ; Entanglement ; PBG
• 刊名：Optics Communications
• 出版年：2012
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：1 June, 2012
• 卷：285
• 期：12
• 页码：2961-2966
• 文件大小：836 K

摘要

We study the system-reservoir dynamics of quantum correlations in the decoherence phenomenon within a two-qubit composite system interacting with a common photonic band-gap (PBG) environment. We compare the dynamics of entanglement with that of quantum discord. By analytical and numerical analyses we find that, the quantum discord can maintain a constant value in the long-time limit even when entanglement suddenly disappears. We also show that the detuning conditions play a crucial role in controlling quantum correlations of the two-qubit system. In PBG environment, the stationary quantum discord can be attained in well-controlled conditions. Our results have lots of potential applications to quantum information processing in nanostructured materials.