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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F13%3A33145379%21RIV14-MSM-15310___
rdf:type
n9:Vysledek skos:Concept
rdfs:seeAlso
http://pra.aps.org/pdf/PRA/v87/i6/e062102
dcterms: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.
dcterms:title
Measuring nonclassical correlations of two-photon states Measuring nonclassical correlations of two-photon states
skos:prefLabel
Measuring nonclassical correlations of two-photon states Measuring nonclassical correlations of two-photon states
skos:notation
RIV/61989592:15310/13:33145379!RIV14-MSM-15310___
n9:predkladatel
n10:orjk%3A15310
n3:aktivita
n19:P
n3: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)
n3:cisloPeriodika
6
n3:dodaniDat
n13:2014
n3:domaciTvurceVysledku
n8:1369342 n8:2344076 n8:4646347 Bartkiewicz, Karol
n3:druhVysledku
n17:J
n3:duvernostUdaju
n5:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
86899
n3:idVysledku
RIV/61989592:15310/13:33145379
n3:jazykVysledku
n14:eng
n3:klicovaSlova
nonclassical correlations, two-photon states
n3:klicoveSlovo
n15:nonclassical%20correlations n15:two-photon%20states
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[ADD732F5912D]
n3:nazevZdroje
Physical Review A
n3:obor
n21:BH
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:projekt
n6:EE2.3.30.0004 n6:ED2.1.00%2F03.0058 n6:EE2.3.20.0017 n6:EE2.3.20.0058 n6:EE2.3.30.0041
n3:rokUplatneniVysledku
n13:2013
n3:svazekPeriodika
87
n3:tvurceVysledku
Černoch, Antonín Lemr, Karel Soubusta, Jan Bartkiewicz, Karol
n3:wos
000319910500002
s:issn
1050-2947
s:numberOfPages
7
n16:doi
10.1103/PhysRevA.87.062102
n20:organizacniJednotka
15310