Conditional purity and quantum correlation measures in two qubit mixed states
arXiv:1602.05863 · doi:10.1088/0953-4075/49/21/215501
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.
16 pages, 5 figures, minor changes, to be published in J. Phys. B
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