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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F12%3A33140113%21RIV13-MSM-15310___
rdf:type
skos:Concept n20:Vysledek
dcterms:description
We study nonclassical correlations beyond entanglement in a family of two-mode non-Gaussian states which represent the continuous-variable counterpart of two-qubit Werner states. We evaluate quantum discord and other quantumness measures obtaining exact analytical results in special instances, and upper and lower bounds in the general case. Non-Gaussian measurements such as photon counting are in general necessary to solve the optimization in the definition of quantum discord, whereas Gaussian measurements are strictly suboptimal for the considered states. The gap between Gaussian and optimal non-Gaussian conditional entropy is found to be proportional to a measure of non-Gaussianity in the regime of low squeezing, for a subclass of continuous-variable Werner states. We further study an example of a non-Gaussian state which is positive under partial transposition, and whose nonclassical correlations stay finite and small even for infinite squeezing. Our results pave the way to a systematic exploration of the interplay between nonclassicality and non-Gaussianity in continuous-variable systems, in order to gain a deeper understanding of-and to draw a bigger advantage from-these two important resources for quantum technology. We study nonclassical correlations beyond entanglement in a family of two-mode non-Gaussian states which represent the continuous-variable counterpart of two-qubit Werner states. We evaluate quantum discord and other quantumness measures obtaining exact analytical results in special instances, and upper and lower bounds in the general case. Non-Gaussian measurements such as photon counting are in general necessary to solve the optimization in the definition of quantum discord, whereas Gaussian measurements are strictly suboptimal for the considered states. The gap between Gaussian and optimal non-Gaussian conditional entropy is found to be proportional to a measure of non-Gaussianity in the regime of low squeezing, for a subclass of continuous-variable Werner states. We further study an example of a non-Gaussian state which is positive under partial transposition, and whose nonclassical correlations stay finite and small even for infinite squeezing. Our results pave the way to a systematic exploration of the interplay between nonclassicality and non-Gaussianity in continuous-variable systems, in order to gain a deeper understanding of-and to draw a bigger advantage from-these two important resources for quantum technology.
dcterms:title
Nonclassical correlations in continuous-variable non-Gaussian Werner states Nonclassical correlations in continuous-variable non-Gaussian Werner states
skos:prefLabel
Nonclassical correlations in continuous-variable non-Gaussian Werner states Nonclassical correlations in continuous-variable non-Gaussian Werner states
skos:notation
RIV/61989592:15310/12:33140113!RIV13-MSM-15310___
n20:predkladatel
n21:orjk%3A15310
n6:aktivita
n12:Z n12:P
n6:aktivity
P(LC06007), Z(MSM6198959213)
n6:cisloPeriodika
2
n6:dodaniDat
n11:2013
n6:domaciTvurceVysledku
n13:3492567
n6:druhVysledku
n15:J
n6:duvernostUdaju
n14:S
n6:entitaPredkladatele
n17:predkladatel
n6:idSjednocenehoVysledku
154348
n6:idVysledku
RIV/61989592:15310/12:33140113
n6:jazykVysledku
n19:eng
n6:klicovaSlova
power; entanglement; Quantum information
n6:klicoveSlovo
n10:Quantum%20information n10:entanglement n10:power
n6:kodStatuVydavatele
US - Spojené státy americké
n6:kontrolniKodProRIV
[2DAE791791E5]
n6:nazevZdroje
Physical Review A
n6:obor
n8:BH
n6:pocetDomacichTvurcuVysledku
1
n6:pocetTvurcuVysledku
4
n6:projekt
n18:LC06007
n6:rokUplatneniVysledku
n11:2012
n6:svazekPeriodika
85
n6:tvurceVysledku
Korolkova, Natalia Tatham, Richard Adesso, Gerardo Mišta, Ladislav
n6:wos
000300564500007
n6:zamer
n16:MSM6198959213
s:issn
1050-2947
s:numberOfPages
12
n3:doi
10.1103/PhysRevA.85.022326
n7:organizacniJednotka
15310