Maximally entangled mixed states: Creation and concentration
arXiv:quant-ph/0308003 · doi:10.1103/PhysRevLett.92.133601
Abstract
Using correlated photons from parametric downconversion, we extend the boundaries of experimentally accessible two-qubit Hilbert space. Specifically, we have created and characterized maximally entangled mixed states (MEMS) that lie above the Werner boundary in the linear entropy-tangle plane. In addition, we demonstrate that such states can be efficiently concentrated, simultaneously increasing both the purity and the degree of entanglement. We investigate a previously unsuspected sensitivity imbalance in common state measures, i.e., the tangle, linear entropy, and fidelity.
4 pages, 3 figures, 1 table; accepted version
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