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Correlation properties of entangled multiphoton states and Bernstein's paradox

机译:纠缠多光子态与伯恩斯坦悖论的相关性质

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A normally ordered characteristic function (NOCF) of Bose operators is calculated for a number of discrete-variable entangled states (Greenberger-Horne-Zeilinger (GHZ) and Werner (W) qubit states and a cluster state). It is shown that such NOCFs contain visual information on two types of correlations: pseudoclassical and quantum correlations. The latter manifest themselves in the interference terms of the NOCFs and lead to quantum paradoxes, whereas the pseudoclassical correlations of photons and their cumulants satisfy the relations for classical random variables. Three- and four-qubit states are analyzed in detail. An implementation of an analog of Bernstein's paradox on discrete quantum variables is discussed. A measure of quantumness of an entangled state is introduced that is not related to the entropy approach. It is established that the maximum of the degree of quantumness substantiates the numerical values of the coefficients in multiqubit vector states derived from intuitive considerations.
机译:针对许多离散变量纠缠态(格林伯格-霍恩-泽林格(GHZ)和沃纳(W)量子位态和簇态)计算Bose算子的正常有序特征函数(NOCF)。结果表明,此类NOCF包含有关两种相关性的视觉信息:伪经典相关性和量子相关性。后者表现为NOCF的干扰项并导致量子悖论,而光子及其累积量的伪经典相关性满足了经典随机变量的关系。详细分析了三个和四个量子位的状态。讨论了伯恩斯坦悖论在离散量子变量上的类似物的实现。介绍了一种与熵方法无关的纠缠态量子度量。可以确定的是,量子程度的最大值证实了从直觉考虑得出的多量子位向量状态下系数的数值。

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