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Entropic entanglement criteria in phase space

We derive entropic inseparability criteria for the phase-space representation of quantum states. In contrast to criteria involving differential entropies of marginal phase-space distributions, our criteria are based on a joint distribution known as the Husimi Q distribution. This distribution is exp...

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Bibliographic Details
Main Authors: Flörchinger, Stefan (Author) , Gärttner, Martin (Author) , Haas, Tobias (Author) , Stockdale, Oliver (Author)
Format: Article (Journal)
Language:English
Published: 5 January 2022
In: Physical review
Year: 2022, Volume: 105, Issue: 1, Pages: 1-7
ISSN:2469-9934
DOI:10.1103/PhysRevA.105.012409
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.105.012409
Verlag, lizenzpflichtig, Volltext: https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=DynamicDOIArticle&SrcApp=WOS&KeyAID=10.1103%2FPhysRevA.105.012409&DestApp=DOI&SrcAppSID=E3VntIhzwrMadul6xAF&SrcJTitle=PHYSICAL+REVIEW+A&DestDOIRegistrantName=American+Physical+Society
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Author Notes:Stefan Floerchinger, Martin Gärttner, Tobias Haas, and Oliver R. Stockdale
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Summary:We derive entropic inseparability criteria for the phase-space representation of quantum states. In contrast to criteria involving differential entropies of marginal phase-space distributions, our criteria are based on a joint distribution known as the Husimi Q distribution. This distribution is experimentally accessible in cold atoms, circuit QED architectures, and photonic systems, and bears practical advantages compared to the detection of marginals. We exemplify the strengths of our entropic approach by considering several classes of non-Gaussian states where second-order criteria fail. We show that our criteria certify entanglement in previously undetectable regions, highlighting the strength of using the Husimi Q distribution for entanglement detection.
Item Description:Gesehen am 27.01.2022
Physical Description:Online Resource
ISSN:2469-9934
DOI:10.1103/PhysRevA.105.012409

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