Maximally entangled mixed states: Creation and concentration

Details Maximally entangled mixed states: Creation and concentration Maximally entangled mixed states: Creation and concentration

2003-07-31

arxiv.org/abs/quant-ph/0308003v2

Phys. Rev. Lett. \bf{92}, 133601 (2004)

Physics

Quantum Physics

4 pages, 3 figures, 1 table; accepted version

Scientific paper

10.1103/PhysRevLett.92.133601

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.

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