2016/03/26 by Kirill Yu. Spasibko, Kirill Spasibko, Denis Kopylov +6 · 1 citation
Computer Science · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Coherence theory #Degenerate energy levels #Orbital Angular Momentum in Optics #Parametric statistics #Phase (matter) #Photon #Photon entanglement #Quantum Information and Cryptography #Quantum entanglement #Quantum optics #Quantum optics and atomic interactions #Spontaneous parametric down-conversion #physics.optics #quant-ph
paper · pdf · doi:10.1364/ol.41.002827
4 pages, 6 figures
arxiv created 2016/03/26 · openalex publication_date 2016/06/13 · openalex created_date 2016/06/24 · arxiv updated 2016/06/29 · openalex updated_date 2026/08/05
We report on the observation of an unusual type of parametric downconversion. In the regime where collinear degenerate emission is in the anomalous range of group-velocity dispersion, its spectrum is restricted in both angle and wavelength. Detuning from exact collinear-degenerate phase-matching leads to a ring shape of the wavelength-angular spectrum, suggesting a new type of spatiotemporal coherence and entanglement of photon pairs. By imposing a phase varying in a specific way in both angle and wavelength, one can obtain an interesting state of an entangled photon pair, with the two photons being never at the same point at the same time.