Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics III
Q 58.30: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Atrium Informatik
Biphoton generation in ultrathin layer of lithium niobate — •Tomás Santiago-Cruz1,2, Cameron Okoth1,2, Andrea Cavanna1,2, and Maria Chekhova1,2,3 — 1Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany — 2University of Erlangen-Nuremberg, Staudtstr. 7/B2, 91058 Erlangen, Germany — 3Department of Physics, M.V. Lomonosov Moscow State Univeristy, Leninskie Gory, 119991 Moscow, Russia
We report for the first time the generation of photon pairs in a micron-thick layer of lithium niobate through spontaneous parametric down conversion (SPDC) without requiring momentum conservation. We have characterized the source by measuring coincidences between photon pairs and the respective single- and two-photon spectrum. The biphoton source exhibits a broad spectrum and correspondingly ultrashort correlation time. Additionally, due to the lack of momentum conservation, the degree of temporal and spatial entanglement is estimated to be very high. Moreover, the generation of SPDC without momentum conservation is not limited to lithium niobate, instead it opens the possibility to use highly nonlinear materials that can improve further the efficiency. Our source is suitable for applications that require the aforementioned properties, such as quantum imaging and distant-clock synchronization.