Conditional purity and quantum correlation measures in two qubit mixed states
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.
Cite
@article{arxiv.1602.05863,
title = {Conditional purity and quantum correlation measures in two qubit mixed states},
author = {L. Rebón and R. Rossignoli and J. J. M. Varga and N. Gigena and N. Canosa and C. Iemmi and S. Ledesma},
journal= {arXiv preprint arXiv:1602.05863},
year = {2016}
}
Comments
16 pages, 5 figures, minor changes, to be published in J. Phys. B