Experimental verification of quantum discord in continuous-variable states

We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and a certain class of non-Gaussian states. We show that any separation in the peaks of the marginal distributions of one subsystem conditioned on two different outcomes of homodyne measurements perfor...

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Published inJournal of physics. B, Atomic, molecular, and optical physics Vol. 47; no. 2; pp. 1 - 8
Main Authors Hosseini, S, Rahimi-Keshari, S, Haw, J Y, Assad, S M, Chrzanowski, H M, Janousek, J, Symul, T, Ralph, T C, Lam, P K
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 28.01.2014
Institute of Physics
Subjects
Beam splitters
Classical and quantum physics: mechanics and fields
Coherence
Conditioning
continuous variable quantum optics
Correlation analysis
Exact sciences and technology
Gaussian
Gaussian states
Non-Gaussian
Physics
Quadratures
quantum discord
Quantum mechanics
Separation
Continuous variables
Quantum correlation
Gaussian states
Vacuum states
Bipartite systems
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Abstract We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and a certain class of non-Gaussian states. We show that any separation in the peaks of the marginal distributions of one subsystem conditioned on two different outcomes of homodyne measurements performed on the other subsystem indicates correlation between the corresponding quadratures, and hence nonzero discord. We also apply this method to non-Gaussian states that are prepared by overlapping a statistical mixture of coherent and vacuum states on a beam splitter. We experimentally demonstrate this technique by verifying nonzero quantum discord in a bipartite Gaussian and certain non-Gaussian states.
AbstractList We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and a certain class of non-Gaussian states. We show that any separation in the peaks of the marginal distributions of one subsystem conditioned on two different outcomes of homodyne measurements performed on the other subsystem indicates correlation between the corresponding quadratures, and hence nonzero discord. We also apply this method to non-Gaussian states that are prepared by overlapping a statistical mixture of coherent and vacuum states on a beam splitter. We experimentally demonstrate this technique by verifying nonzero quantum discord in a bipartite Gaussian and certain non-Gaussian states.
Author Rahimi-Keshari, S
Symul, T
Hosseini, S
Chrzanowski, H M
Janousek, J
Haw, J Y
Ralph, T C
Lam, P K
Assad, S M
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  organization: The Australian National University Center for Quantum Computation and Communication Technology, Department of Quantum Science, Canberra, ACT 0200, Australia
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Snippet We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and a certain class of non-Gaussian states. We show that any...
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SubjectTerms Beam splitters
Classical and quantum physics: mechanics and fields
Coherence
Conditioning
continuous variable quantum optics
Correlation analysis
Exact sciences and technology
Gaussian
Gaussian states
Non-Gaussian
Physics
Quadratures
quantum discord
Quantum mechanics
Separation
Title Experimental verification of quantum discord in continuous-variable states
URI https://iopscience.iop.org/article/10.1088/0953-4075/47/2/025503
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