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Ring-shaped spectra of parametric downconversion and entangled photons that never meet

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Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Chekhova,  Maria V.
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Optical Technologies, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Spasibko, K. Y., Kopylov, D. A., Murzina, T. V., Leuchs, G., & Chekhova, M. V. (2016). Ring-shaped spectra of parametric downconversion and entangled photons that never meet. OPTICS LETTERS, 41(12), 2827-2830. doi:10.1364/OL.41.002827.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-62B9-A
Abstract
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. (C) 2016 Optical Society of America