Abstract

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.

© 2018 Optical Society of America

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