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

MPS-Authors
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Chille,  Vanessa
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Peuntinger,  Christian
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201126

Marquardt,  Christoph
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201115

Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Chille, V., Quinn, N., Peuntinger, C., Croal, C., Mista Jr., L., Marquardt, C., et al. (2015). Quantum nature of Gaussian discord: Experimental evidence and role of system-environment correlations. PHYSICAL REVIEW A, 91(5): 050301. doi:10.1103/PhysRevA.91.050301.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-63C8-B
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.