Phys. Rev. A 69, 023811 (2004) [6 pages]Entanglement and conservation of orbital angular momentum in spontaneous parametric down-conversionReceived 19 November 2003; published 25 February 2004 We show that the transfer of the plane-wave spectrum of the pump beam to the fourth-order transverse spatial correlation function of the two-photon field generated by spontaneous parametric down-conversion leads to the conservation and entanglement of orbital angular momentum of light. By means of a simple experimental setup based on fourth-order (or two-photon) interferometry, we show that our theoretical model provides a good description for down-converted fields carrying orbital angular momentum. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.69.023811
DOI:
10.1103/PhysRevA.69.023811
PACS:
42.50.St, 03.65.Ud, 42.50.Ar
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