About: Measuring nonclassical correlations of two-photon states

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Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://pra.aps.org/pdf/PRA/v87/i6/e062102
Description	The threshold between classical and nonclassical two-qubit states is drawn at the place when these states can no longer be described by classical correlations, i.e., quantum discord or entanglement appear. However, to check if the correlations are classical (in terms of quantum discord and entanglement) it is sufficient to witness the lack of quantum discord because its zero value implies the lack of entanglement. We explain how the indicator of quantum discord introduced by Girolami and Adesso [Phys. Rev. Lett. 108, 150403 (2012)] can be practically measured in linear-optical systems using standard beam splitters and photon detectors. We study the efficiency of the setup assuming both ideal and real components and show that the efficiency of the proposed implementation is better than the full two-photon quantum tomography. Thus, we demonstrate that a class of experiments previously available on NMR platform can be implemented in optical systems. The threshold between classical and nonclassical two-qubit states is drawn at the place when these states can no longer be described by classical correlations, i.e., quantum discord or entanglement appear. However, to check if the correlations are classical (in terms of quantum discord and entanglement) it is sufficient to witness the lack of quantum discord because its zero value implies the lack of entanglement. We explain how the indicator of quantum discord introduced by Girolami and Adesso [Phys. Rev. Lett. 108, 150403 (2012)] can be practically measured in linear-optical systems using standard beam splitters and photon detectors. We study the efficiency of the setup assuming both ideal and real components and show that the efficiency of the proposed implementation is better than the full two-photon quantum tomography. Thus, we demonstrate that a class of experiments previously available on NMR platform can be implemented in optical systems. (en)
Title	Measuring nonclassical correlations of two-photon states Measuring nonclassical correlations of two-photon states (en)
skos:prefLabel	Measuring nonclassical correlations of two-photon states Measuring nonclassical correlations of two-photon states (en)
skos:notation	RIV/61989592:15310/13:33145379!RIV14-MSM-15310___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(ED2.1.00/03.0058), P(EE2.3.20.0017), P(EE2.3.20.0058), P(EE2.3.30.0004), P(EE2.3.30.0041)
http://linked.open...iv/cisloPeriodika	6
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Soubusta, Jan Černoch, Antonín Lemr, Karel Bartkiewicz, Karol
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Palackého v Olomouci / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	86899
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/13:33145379
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	nonclassical correlations, two-photon states (en)
http://linked.open.../riv/klicoveSlovo	nonclassical correlations two-photon states
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[ADD732F5912D]
http://linked.open...i/riv/nazevZdroje	Physical Review A
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Podpora vytváření excelentních výzkumných týmů a intersektorální mobility na Univerzitě Palackého v Olomouci II. Regional Centre of Advanced Technologies and Materials Research team development of the Regional Centre of Advanced Technologies and Materials POST-UP Integration of Regional Centre of Advanced Technologies and Materials into International Networks of Nanotechnological and Optical Research.
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	87
http://linked.open...iv/tvurceVysledku	Lemr, Karel Soubusta, Jan Černoch, Antonín Bartkiewicz, Karol
http://linked.open...ain/vavai/riv/wos	000319910500002
issn	1050-2947
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevA.87.062102
http://localhost/t...ganizacniJednotka	15310

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