Quantum nature of Gaussian discord: Experimental evidence and role of system-environment correlations

Chille V, Quinn N, Peuntinger C, Croal C, Mista L, Marquardt C, Leuchs G, Korolkova N (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Physical Review A - Atomic, Molecular, and Optical Physics American Physical Society

Book Volume: 91

Article Number: 050301

Journal Issue: 5

DOI: 10.1103/PhysRevA.91.050301

Abstract

We provide experimental evidence of quantum features in bipartite states classified as entirely classical according to a conventional criterion based on the Glauber P function but possessing nonzero Gaussian quantum discord. Their quantum nature is experimentally revealed by acting locally on one part of the discordant state. We experimentally verify and investigate the effect of discord increase under the action of local loss and link it to the entanglement with the environment. Adding an environmental system purifying the state, we unveil the flow of quantum correlations within a global pure system using the Koashi-Winter inequality. For a discordant state generated by splitting a state in which the initial squeezing is destroyed by random displacements, we demonstrate the recovery of entanglement highlighting the role of system-environment correlations.

Authors with CRIS profile

Christoph Marquardt Lehrstuhl für Experimentalphysik (Optik) Gerhard Leuchs

Involved external institutions

University of St Andrews GB United Kingdom (GB) Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) Palacky University Olomouc / Univerzita Palackého v Olomouci CZ Czech Republic (CZ)

How to cite

APA:

Chille, V., Quinn, N., Peuntinger, C., Croal, C., Mista, L., Marquardt, C.,... Korolkova, N. (2015). Quantum nature of Gaussian discord: Experimental evidence and role of system-environment correlations. Physical Review A - Atomic, Molecular, and Optical Physics, 91(5). https://doi.org/10.1103/PhysRevA.91.050301

MLA:

Chille, Vanessa, et al. "Quantum nature of Gaussian discord: Experimental evidence and role of system-environment correlations." Physical Review A - Atomic, Molecular, and Optical Physics 91.5 (2015).

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