About: Measurement-induced disturbances and nonclassical correlations of Gaussian states

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. (en)
Title	Measurement-induced disturbances and nonclassical correlations of Gaussian states Measurement-induced disturbances and nonclassical correlations of Gaussian states (en)
skos:prefLabel	Measurement-induced disturbances and nonclassical correlations of Gaussian states Measurement-induced disturbances and nonclassical correlations of Gaussian states (en)
skos:notation	RIV/61989592:15310/11:10224800!RIV12-MSM-15310___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(7E08028), P(GA202/08/0224), P(LC06007), Z(MSM6198959213)
http://linked.open...iv/cisloPeriodika	4
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Mišta, Ladislav
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	211170
http://linked.open...ai/riv/idVysledku	RIV/61989592:15310/11:10224800
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	INFORMATION; ENTANGLEMENT; QUANTUM; CONTINUOUS-VARIABLE SYSTEMS (en)
http://linked.open.../riv/klicoveSlovo	INFORMATION CONTINUOUS-VARIABLE SYSTEMS ENTANGLEMENT QUANTUM
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[0D14B42BADF4]
http://linked.open...i/riv/nazevZdroje	Physical Review A
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Centre of Modern Optics Computing with Mesoscopic Photonic and Atomic States Electro-optical control of quantum noise of light
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	83
http://linked.open...iv/tvurceVysledku	Mišta, Ladislav Adesso, Gerardo Girolami, Davide Korolkova, Natalia Tarham, Richard
http://linked.open...ain/vavai/riv/wos	000290105300006
http://linked.open...n/vavai/riv/zamer	Measurement and Information in Optics
issn	1050-2947
number of pages	15 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevA.83.042325
http://localhost/t...ganizacniJednotka	15310

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