2005/03/02 by S. P. Walborn, A. N. de Oliveira, R. S. Thebaldi +1 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.69.023811
published as Phys. Rev. A 69, 023811 (2004) · 6 pages, 5 figures
arxiv created 2005/03/02 · arxiv updated 2009/12/01
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.