Extrinsic orbital angular momentum of entangled photon-pairs in spontaneous parametric down-conversion

Details Extrinsic orbital angular momentum of entangled photon-pairs in spontaneous parametric down-conversion Extrinsic orbital angular momentum of entangled photon-pairs in spontaneous parametric down-conversion

2008-05-13

arxiv.org/abs/0805.1924v3

Physics

Quantum Physics

7 pages, 3 figures, Some clarification added in calculations

Scientific paper

Starting from the standard Hamiltonian describing the optical non-linear process of spontaneous parametric down-conversion, we theoretically show that the generated entangled photon-pairs carry non-negligible orbital angular momentum in the degrees of freedom of relative movement in the type-II cases due to spatial symmetry breaking. We also show that the orbital angular momentum carried by photon-pairs in these degrees of freedom escapes detection in the traditional measurement scheme, which demands development of new techniques for further experimental investigations.

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