Conditional purity and quantum correlation measures in two qubit mixed states. (17th October 2016)

• Record Type: Journal Article
• Authors: Rebón, L; Rossignoli, R; Varga, J J M; Gigena, N; Canosa, N; Iemmi, C; Ledesma, S
• Is Part Of: Journal of physics. Volume 49:Number 21(2016:Nov. 01)
• Publication Date: 2016-10-17
• Subjects: quantum information -- measures of quantum correlations -- experimental test with single photons; 03.67.-a -- 03.65.Ud -- 03.65.Ta -- 42.50.Ex; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/0953-4075/49/21/215501
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: We analyze and show experimental results of the conditional purity, the quantum discord and other related measures of quantum correlation in mixed two-qubit states constructed from a pair of photons in identical polarization states. The considered states are relevant for the description of spin pair states in interacting spin chains in a transverse magnetic field. We derive clean analytical expressions for the conditional local purity and other correlation measures obtained as a result of a remote local projective measurement, which are fully verified by the experimental results. A simple exact expression for the quantum discord of these states in terms of the maximum conditional purity is also derived.