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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F11%3A10224800%21RIV12-MSM-15310___
rdf:type
skos:Concept n16:Vysledek
dcterms:description
We study quantum correlations beyond entanglement in two-mode Gaussian states of continuous-variable systems by means of the measurement-induced disturbance (MID) and its ameliorated version (AMID). In analogy with the recent studies of the Gaussian quantum discord, we define a Gaussian AMID by constraining the optimization to all bi-local Gaussian positive operator valued measurements. We solve the optimization explicitly for relevant families of states, including squeezed thermal states. Remarkably, we find that there is a finite subset of two-mode Gaussian states comprising pure states where non-Gaussian measurements such as photon counting are globally optimal for the AMID and realize a strictly smaller state disturbance compared to the best Gaussian measurements. However, for the majority of two-mode Gaussian states the unoptimized MID provides a loose overestimation of the actual content of quantum correlations, as evidenced by its comparison with Gaussian discord. We study quantum correlations beyond entanglement in two-mode Gaussian states of continuous-variable systems by means of the measurement-induced disturbance (MID) and its ameliorated version (AMID). In analogy with the recent studies of the Gaussian quantum discord, we define a Gaussian AMID by constraining the optimization to all bi-local Gaussian positive operator valued measurements. We solve the optimization explicitly for relevant families of states, including squeezed thermal states. Remarkably, we find that there is a finite subset of two-mode Gaussian states comprising pure states where non-Gaussian measurements such as photon counting are globally optimal for the AMID and realize a strictly smaller state disturbance compared to the best Gaussian measurements. However, for the majority of two-mode Gaussian states the unoptimized MID provides a loose overestimation of the actual content of quantum correlations, as evidenced by its comparison with Gaussian discord.
dcterms:title
Measurement-induced disturbances and nonclassical correlations of Gaussian states Measurement-induced disturbances and nonclassical correlations of Gaussian states
skos:prefLabel
Measurement-induced disturbances and nonclassical correlations of Gaussian states Measurement-induced disturbances and nonclassical correlations of Gaussian states
skos:notation
RIV/61989592:15310/11:10224800!RIV12-MSM-15310___
n16:predkladatel
n18:orjk%3A15310
n3:aktivita
n19:P n19:Z
n3:aktivity
P(7E08028), P(GA202/08/0224), P(LC06007), Z(MSM6198959213)
n3:cisloPeriodika
4
n3:dodaniDat
n13:2012
n3:domaciTvurceVysledku
n4:3492567
n3:druhVysledku
n20:J
n3:duvernostUdaju
n21:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
211170
n3:idVysledku
RIV/61989592:15310/11:10224800
n3:jazykVysledku
n11:eng
n3:klicovaSlova
INFORMATION; ENTANGLEMENT; QUANTUM; CONTINUOUS-VARIABLE SYSTEMS
n3:klicoveSlovo
n5:ENTANGLEMENT n5:QUANTUM n5:CONTINUOUS-VARIABLE%20SYSTEMS n5:INFORMATION
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[0D14B42BADF4]
n3:nazevZdroje
Physical Review A
n3:obor
n17:BH
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:projekt
n6:7E08028 n6:GA202%2F08%2F0224 n6:LC06007
n3:rokUplatneniVysledku
n13:2011
n3:svazekPeriodika
83
n3:tvurceVysledku
Tarham, Richard Girolami, Davide Adesso, Gerardo Mišta, Ladislav Korolkova, Natalia
n3:wos
000290105300006
n3:zamer
n10:MSM6198959213
s:issn
1050-2947
s:numberOfPages
15
n15:doi
10.1103/PhysRevA.83.042325
n9:organizacniJednotka
15310