Maximally entangled mixed states: creation and concentration

Using correlated photons from parametric down-conversion, we extend the boundaries of experimentally accessible two-qubit Hilbert space. Specifically, we have created and characterized maximally entangled mixed states that lie above the Werner boundary in the linear entropy-tangle plane. In addition...

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Bibliographic Details
Published in:Physical review letters 2004-04, Vol.92 (13), p.133601-133601, Article 133601
Main Authors: Peters, Nicholas A, Altepeter, Joseph B, Branning, David, Jeffrey, Evan R, Wei, Tzu-Chieh, Kwiat, Paul G
Format: Article
Language:English
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Summary:Using correlated photons from parametric down-conversion, we extend the boundaries of experimentally accessible two-qubit Hilbert space. Specifically, we have created and characterized maximally entangled mixed states 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.133601