Density matrices of pure multiphoton Fock polarization states and their resultant reduced density matrices of mixed states are expressed in similar ways in terms of matrices of correlators, defined as averaged products of equal numbers of creation and annihilation operators. The degree of entanglement of considered states is evaluated for various combinations of parameters of states and characters of their reduction.

中文翻译：

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多光子双模偏振 Fock 态及其叠加的纠缠

纯多光子 Fock 偏振态的密度矩阵及其合成的混合态密度降低矩阵以类似的方式用相关器矩阵表示，定义为相等数量的创建和湮灭算子的平均乘积。所考虑状态的纠缠度是针对状态参数的各种组合及其减少特征进行评估的。