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首页> 外文期刊>Open Systems & Information Dynamics >Robustness of Quantum Correlations in Entangled Two su(2) Systems Non-mutually Interacting with su(l, 1) System under Intrinsic Decoherence
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Robustness of Quantum Correlations in Entangled Two su(2) Systems Non-mutually Interacting with su(l, 1) System under Intrinsic Decoherence

机译：在固有退相干下纠缠的两个su（2）系统与su（l，1）系统互不影响的纠缠态中的量子相关性的鲁棒性

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摘要

Two two-level systems generated by su(2) algebra are initially prepared in a maximum nonsymmetric Bell state and having no mutual interaction. Each su(2)-system spatially interacts with two-mode cavity field in the nondegenerate parametric amplifier type cast through operators governed by su(l, 1) Lie algebra. An analytical description for the time evolution of the final state of the total system with the effect of intrinsic decoherence is found. Therefore, the robustness of the quantum correlations between the two su(2)-system is investigated by means of geometric quantum discord, measurement-induced nonlocality and negativity. We analyze in some detail the influence of initial coherence intensities, detuning and phase decoherence parameters on the steady-state correlation. We find that the steady-state correlations can be generated and enhanced by controlling the parameters of: the initial coherence intensities, the Bargmman index and the detuning. It is shown that the phenomenon of sudden death and re-birth of entanglement, and the sudden changes of the geometric quantum correlation can be controlled by these parameters. We find that the robustness of the quantum correlation can be greatly enhanced by the Bargmman index and the resonance detuning. Negativity is the measure most susceptible to phase decoherence, while geometric quantum discord and measurement-induced nonlocality are the more robust measures.
机译：由su（2）代数生成的两个两级系统最初是在最大非对称贝尔状态下准备的，并且没有相互影响。每个su（2）系统在空间上与通过su（1，1）Lie代数控制的算符转换的非简并参数放大器类型中的双模腔场相互作用。找到了具有内在退相干效应的整个系统最终状态的时间演化的分析描述。因此，通过几何量子不协调，测量引起的非局部性和负性研究了两个su（2）系统之间的量子相关性的鲁棒性。我们详细分析了初始相干强度，失谐和相位相干参数对稳态相关性的影响。我们发现可以通过控制以下参数来生成和增强稳态相关性：初始相干强度，巴格曼指数和失谐。结果表明，这些参数可以控制猝死和纠缠重生的现象，以及几何量子相关性的突然变化。我们发现，通过Bargmman指数和共振失谐可以大大提高量子相关性的鲁棒性。负性是最容易发生相位退相干的量度，而几何量子不和谐和测量引起的非局部性是更可靠的量度。

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