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, 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.
Peters
Nicholas A
NA
Physics Department, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA.
Altepeter
Joseph B
JB
Branning
David
D
Jeffrey
Evan R
ER
Wei
Tzu-Chieh
TC
Kwiat
Paul G
PG