Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.60: Poster
Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal
Generation of squeezed vacuum states in a nonlinear crystalline whispering gallery mode resonator — •Alexander Otterpohl1,2, Florian Sedlmeir1,2, Thomas Dirmeier1,2, Ulrich Vogl1,2, Gerhard Schunk1,2, Golnoush Shafiee1,2, Dmitry Strekalov1,2, Harald G. L. Schwefel3, Tobias Gehring4, Ulrik L. Andersen4, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany — 2Institute of Optics, Information and Photonics, University Erlangen-Nürnberg, Staudtstr. 7 B2, 91058 Erlangen, Germany — 3The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Otago, 730 Cumberland Street, 9016 Dunedin, New Zealand — 4Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kgs. Lyngby, Denmark
Macroscopic crystalline whispering gallery mode resonators (WGMR) made out of LiNbO3 are a versatile source of non-classical light generated via optical parametric down-conversion [1]. Previously, we demonstrated squeezing of a bright single parametric beam as well as twin-beam squeezing above threshold. Now, we operate our source below the oscillation threshold at the degenerate point to generate squeezed vacuum states. We currently achieve up to 1 dB squeezing closely below threshold, which corresponds to only tens of microwatts of pump power. The low threshold allows us to investigate squeezing in a regime closely above and below the threshold.
[1] J. U. Fürst et al., Phys. Rev. Lett. 106, 113901 (2011).