"US - Spojen\u00E9 st\u00E1ty americk\u00E9" . . "211170" . . . . "[0D14B42BADF4]" . "Measurement-induced disturbances and nonclassical correlations of Gaussian states"@en . "1"^^ . "15"^^ . "15310" . . . . . "Measurement-induced disturbances and nonclassical correlations of Gaussian states"@en . "000290105300006" . "Tarham, Richard" . "RIV/61989592:15310/11:10224800!RIV12-MSM-15310___" . . . "Measurement-induced disturbances and nonclassical correlations of Gaussian states" . "4" . . "83" . "INFORMATION; ENTANGLEMENT; QUANTUM; CONTINUOUS-VARIABLE SYSTEMS"@en . "10.1103/PhysRevA.83.042325" . "Girolami, Davide" . . "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." . . "Measurement-induced disturbances and nonclassical correlations of Gaussian states" . . . "Adesso, Gerardo" . . . "RIV/61989592:15310/11:10224800" . . "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 . "Mi\u0161ta, Ladislav" . "P(7E08028), P(GA202/08/0224), P(LC06007), Z(MSM6198959213)" . . . "5"^^ . "Physical Review A" . "Korolkova, Natalia" . . "1050-2947" .