Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Optics I
Q 11.7: Talk
Monday, March 9, 2020, 15:30–15:45, f342
Spectral properties of the cavity-enhanced spontaneous parametric down-conversion below the cavity threshold — •Golnoush Shafiee1,2, Dmitry V. Strekalov1, Alexander Otterpohl1,2,3, Florian Sedlmeir1, Gerhard Schunk1, Ulrich Vogl1, Harald G.L. Schwefel4, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Institute of Optics, Information and Photonics, Friedrich-Alexander University Erlangen-Nuremberg, Germany — 3Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander University Erlangen-Nuremberg, Germany — 4The Dodd-Walls Centre for Photonic and Quantum Technologies, Dunedin, New Zealand
Single photons and photon pairs are an important resource for quantum information processing. This motivated a thorough study of the spectral and temporal properties of parametric light, both above and below the Optical Parametric Oscillator (OPO) threshold. The pursuit of a higher two-photon emission rate leads into an intermediate regime where the OPO still operates below the threshold but the nonlinear cavity phenomena cannot be neglected anymore. Here, we investigate the properties of the down-converted photons from a whispering gallery resonator, using correlation measurements, from far below the threshold to close enough to the OPO threshold such that stimulated processes already become important