Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.81: Poster
Monday, March 23, 2015, 17:00–19:00, C/Foyer
Improved generation of squeezed states of light at 532 nm by frequency up-conversion from 1550 nm — •Jan Gniesmer1,2, Christoph Baune1, Axel Schönbeck1, Jaromír Fiurášek3, and Roman Schnabel1,4 — 1Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstrasse 38, 30167 Hannover, Germany — 2Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 3Department of Optics, Palacký University, 17. listupadu 12, 77146 Olomouc, Czech Republic — 4Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
Frequency up-conversion of non-classical states of light provides access to so-far inaccessible wavelengths. Vollmer et al. demonstrated squeezed vacuum states at 532 nm with a noise suppression of 1.5 dB [1]. These were generated by up-conversion of squeezed states at the telecom wavelength 1550 nm. We report on improvements of the same optical setup to achieve stronger squeezing. In particular this involves characterization of the initial squeezing at 1550 nm, better up-conversion efficiency and an advanced homodyne detection setup at 532 nm. The latter has a detection efficiency of 90%. These squeezed states can be used in downstream experiments, for example to improve the sensitivity of an interferometer.
[1] C. E. Vollmer et al., Phys. Rev. Lett. 112, 073602 (2014)