2001/06/21 by G. Bitton, Warren P. Grice, W. P. Grice +3 · 18 citations
Chemistry · Computer Science · Physics and Astronomy · #Chemistry #Laser #Laser-Matter Interactions and Applications #Optics #Parametric statistics #Phase matching #Photon #Photon entanglement #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Spontaneous parametric down-conversion #quant-ph
paper · pdf · doi:10.1103/physreva.65.063805
published in Physical Review A 65(6) (American Physical Society) · 8 pages 8 figures
arxiv created 2001/06/21 · openalex publication_date 2002/06/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
An ultrabright source of polarization-entangled photons has been realized using type-II phase matching in the spontaneous parametric down-conversion process in two cascaded crystals. The optical axes of the crystals are aligned in such a way that the extraordinarily (ordinarily) polarized cone from one crystal overlaps with the ordinarily (extraordinarily) polarized cone from the second crystal. This spatial overlapping removes the association between the polarization and the output angle of the photons that exists in a single type-II down-conversion process. Hence, entanglement of photon pairs originating from any conjugate points on the output cones is possible if a suitable optical delay line is used. This delay line is particularly simple and easy to implement.