Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Poster: Quantum Optics and Photonics II
Q 40.40: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG2
Squeezing Distillation from Atmospheric Fluctuations — •Kevin Günthner1,2, Ömer Bayraktar1,2, Andreas Thurn1,2, Christian Peuntinger1,2, Dominique Elser1,2, Christoph Marquardt1,2, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany. — 2Department of Physics, University of Erlangen-Nuremberg (FAU), Germany.
We show the distillation of squeezed states of light, that have been transmitted through a 1.6 km urban, atmospheric free-space channel [1]. Squeezed states of light are interesting and important non-classical states for quantum information processing [2]. The efficiency of possible applications, e.g., quantum key distribution [3], crucially relies on a state’s nonclassicality, i.e., the degree of squeezing. The atmospheric channel introduces intensity fluctuations through beam wandering and scintillation considering the finite receiving aperture size. This real physical, non-gaussian noise will unavoidably lead to reduction of squeezing after transmission. We combat this degrading by employing various purification and distillation protocols, hence selecting states with high degree of squeezing [1,4].
[1] C. Peuntinger et al., Phys. Rev. Lett. 113, 060502 (2014).
[2] U. L. Andersen et al., Physica Scripta 91, 053001 (2016).
[3] L. S. Madsen et al., Nature Comm. 3, 1083 (2012).
[4] J. Heersink et al., Phys. Rev. Lett. 96, 25 (2006).