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Avoiding entanglement sudden death via measurement feedback control in a quantum network

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dc.contributor.authorYamamoto, Naoki
dc.contributor.authorNurdin, Hendra
dc.contributor.authorJames, Matthew R
dc.contributor.authorPetersen, Ian
dc.date.accessioned2009-12-15T22:58:57Zen_US
dc.date.accessioned2010-12-20T06:04:22Z
dc.date.available2009-12-15T22:58:57Zen_US
dc.date.available2010-12-20T06:04:22Z
dc.date.issued2008-10-31en_US
dc.date.updated2016-02-24T12:10:57Z
dc.description.abstractIn this paper, we consider a linear quantum network composed of two distantly separated cavities that are connected via a one-way optical field. When one of the cavities is damped and the other undamped, the overall cavity state obtains a large amount of entanglement in its quadratures. This entanglement, however, immediately decays and vanishes in a finite time. That is, entanglement sudden death occurs. We show that the direct measurement feedback method proposed by Wiseman can avoid this entanglement sudden death, and, further, enhance the entanglement. It is also shown that the entangled state under feedback control is robust against signal loss in a realistic detector, indicating the reliability of the proposed direct feedback method in practical situations.
dc.format11 pages
dc.identifier.citationPhysical Review A 78.4 (2008): 042339/1-11
dc.identifier.issn1050-2947en_US
dc.identifier.issn1094-1622en_US
dc.identifier.urihttp://hdl.handle.net/10440/1010en_US
dc.identifier.urihttp://digitalcollections.anu.edu.au/handle/10440/1010
dc.publisherAmerican Physical Society
dc.rightshttp://www.sherpa.ac.uk/romeo/index.php "Author can archive pre-print (ie pre-refereeing) … post-print (ie final draft post-refereeing) … [and] publisher's version/PDF. Link to publisher version … [and] Copyright notice required. Publisher's version/PDF can be used on … employers web site." - from SHERPA/RoMEO site (as at 25/02/10). ©2008 The American Physical Society
dc.sourcePhysical Review A: Atomic, Molecular and Optical Physics
dc.source.urihttp://dx.doi.org/10.1103/PhysRevA.78.042339en_US
dc.subjectKeywords: Control theory; Feedback control; Quantum optics; Robust control; State feedback; Direct feedbacks; Direct measurements; Entangled states; Finite times; Measurement feedbacks; Optical fields; Quantum networks; Realistic detectors; Signal losses; Sudden de
dc.titleAvoiding entanglement sudden death via measurement feedback control in a quantum network
dc.typeJournal article
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage042339
local.contributor.affiliationYamamoto, Naoki, Keio Universityen_US
local.contributor.affiliationNurdin, Hendra, Research School of Information Sciences and Engineering, Department of Information Engineeringen_US
local.contributor.affiliationJames, Matthew R, Faculty of Engineering and Information Technology, Department of Engineeringen_US
local.contributor.affiliationPetersen, Ian, University of New South Wales, ADFAen_US
local.contributor.authoruidE34157en_US
local.contributor.authoruidu4078820en_US
local.contributor.authoruidu9109947en_US
local.contributor.authoruidE34168en_US
local.identifier.absfor090699en_US
local.identifier.ariespublicationu9606031xPUB48en_US
local.identifier.citationvolume78
local.identifier.doi10.1103/PhysRevA.78.042339
local.identifier.scopusID2-s2.0-55749092480
local.identifier.thomsonID000260574100069
local.identifier.uidSubmittedByu8103816en_US
local.type.statusPublished Versionen_US

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