We address a recently established relationship, ${\mathcal{C}}^2+{\mathcal{P}}^2=1$, which engages concurrence ($\mathcal{C}$) and polarization ($\mathcal{P}$). This relationship has revealed a striking connection between two seemingly unrelated measures. Indeed, while $\mathcal{C}$ quantifies entanglement, which is widely seen as a quantum information resource, $\mathcal{P}$ quantifies the amount of coherence between optical field components. We discuss the conditions under which $\mathcal{C}$ and $\mathcal{P}$ may be related to one another and show how the optical approach discloses entanglement as a resource that may be found in both the quantum and the classical domain. This is confirmed by a proposed Bell violation that can be exhibited using either quantum or classical light.

中文翻译：

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并发和极化的光学方法

我们处理了最近建立的关系， ${\mathcal{C}}^{\mathrm{2个}}+{\mathcal{P}}^{\mathrm{2个}}=\mathrm{1个}$，这需要并发（$\mathcal{C}$）和极化（$\mathcal{P}$）。这种关系揭示了两个看似无关的措施之间的惊人联系。确实，虽然$\mathcal{C}$ 量化纠缠，纠缠被广泛视为量子信息资源， $\mathcal{P}$量化光场分量之间的相干量。我们讨论在什么条件下$\mathcal{C}$ 和 $\mathcal{P}$可能彼此相关，并且表明光学方法如何将纠缠作为一种可以在量子域和经典域中都可以找到的资源来公开。可以通过使用量子光或经典光表现出的拟议的贝尔违规来证实这一点。