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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.28: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Experimental Investigation of Quantum Discord and Entanglement in Bi-partite Systems — •Christian Peuntinger1,2, Vanessa Chille1,2, Niall Quinn3, Callum Croal3, Ladislav Mišta4, Christoph Marquardt1,2, Gerd Leuchs1,2, and Natalia Korolkova3 — 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1/Bldg. 24, Erlangen, Germany — 2Institute of Optics, Information and Photonics, University of Erlangen-Nürnberg, Staudtstr. 7/B2, Erlangen, Germany — 3School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, UK — 4Department of Optics, Palacký University, 17. listopadu 12, 771 46 Olomouc, Czech Republic
We experimentally investigate quantum features in a bi-partite Gaussian state. The state is generated by modulating an initially squeezed state and mixing it with the vacuum on a symmetric beamsplitter. Due to the modulation, the squeezing is destroyed and the output state is separable, but it possesses Gaussian quantum discord. The quantum nature of the state is experimentally revealed by acting locally on one part of the discordant state. By attenuating one of the output modes we explore discord dynamics in an open system
and measure the counterintuitive discord increase. To further highlight the quantumness of the separable bi-partite state we demonstrate the recovery of entanglement. By considering an “environmental system” purifying the state we are able to unveil the flow of correlations in the global system and link the effects above to entanglement with the environment.
Vanessa Chille et al., ArXiv:1411.6922