We devise and experimentally realize a procedure capable of detecting and distinguishing quantum discord and classical correlations as well the presence of factorized states in a joint system-environment setting. Our scheme builds on recent theoretical results showing how the distinguishability between two reduced states of a quantum system in a bipartite setting can convey important information about the correlations present in the bipartite state and the interaction between the subsystems. The two addressed subsystems are the polarization and spatial degrees of freedom of the signal beam generated by parametric down-conversion, which are suitably prepared by the idler beam. Different global and local operations allow for the detection of different correlations by studying via state tomography the trace distance behavior between suitable polarization subsystem states.

Two-step procedure to discriminate discordant from classical correlated or factorized states / S. Cialdi, A. Smirne, M.G.A. Paris, S. Olivares, B. Vacchini. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 90:5(2014), pp. 050301.1-050301.5. [10.1103/PhysRevA.90.050301]

Two-step procedure to discriminate discordant from classical correlated or factorized states

S. Cialdi
Primo
;
A. Smirne
Secondo
;
M.G.A. Paris;S. Olivares
Penultimo
;
B. Vacchini
Ultimo
2014

Abstract

We devise and experimentally realize a procedure capable of detecting and distinguishing quantum discord and classical correlations as well the presence of factorized states in a joint system-environment setting. Our scheme builds on recent theoretical results showing how the distinguishability between two reduced states of a quantum system in a bipartite setting can convey important information about the correlations present in the bipartite state and the interaction between the subsystems. The two addressed subsystems are the polarization and spatial degrees of freedom of the signal beam generated by parametric down-conversion, which are suitably prepared by the idler beam. Different global and local operations allow for the detection of different correlations by studying via state tomography the trace distance behavior between suitable polarization subsystem states.
quantum
Settore FIS/03 - Fisica della Materia
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/246784
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