Bell-like inequality for spin-orbit separability of a classical laser beam

Authors
Borges, C. V. S.
Hor-Meyll, M.
Huguenin, J. A. O.
Khoury, A. Z.
Description
In analogy with Bell's inequality for two-qubit quantum states we propose an inequality criterion for the non-separability of the spin-orbit degrees of freedom of a classical laser beam. A definition of separable and non-separable spin-orbit modes is used in consonance with the one presented in Phys. Rev. Lett. 99, 160401 (2007). As the usual Bell's inequality can be violated for entangled two-qubit quantum states, we show both theoretically and experimentally that the proposed spin-orbit inequality criterion can be violated for non-separable modes. A discussion on the classical-quantum transition is also presented.
Comment: 4 pages, 2 figures
Quantum Physics