Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.42: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
coupled spatiotemporal coherence for parametric down-conversion under negative group velocity dispersion. — •Paula Cutipa1,2 and Maria V. Chekhova1,2,3 — 1Max Planck Institute for the Science of Light, Staudtstr. 2, 9108 Erlangen, Germany. — 2University of Erlangen-Nuremberg, Staudtstr.7/B2, 91058 Erlangen, Germany — 3Department of Physics, M. V. Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
Parametric down-conversion (PDC) is one of the sources to generate entangled photon pairs and twin beams, which have many applications in quantum metrology and quantum information. It is well known that type-I PDC usually has a specific X-shape wavelength-angle spectra. Meanwhile, it has been shown that in the negative group velocity dispersion range PDC has a ring-shaped wavelength-angle spectrum, which is restricted in both variables [1]. This means that the first-order correlation function of PDC has coupled spatiotemporal dependence (is not just a function on time or space, or a product of two functions). In this work, we measure the first-order correlation function of this unusual PDC showing that a temporal delay can be compensated by a spatial displacement.
[1] K. Yu. Spasibko, D. A. Kopylov, T. V. Murzina, G. Leuchs, and M. V. Chekhova, Ring-shaped spectra of parametric downconversion and entangled photons that never meet. Optics Letters 41, 2627 (2016)