AI Article Synopsis
- The study focuses on estimating concurrence, a measure of quantum entanglement, in mixed quantum states through direct methods.
- The approach involves performing joint measurements on two copies of an entangled state and uses linear optics with controlled phase gates.
- The experimental results show that reliable estimates of concurrence can be obtained directly from the measurements, even with some imperfections in the experiment.
Article Abstract
We report on the direct estimation of concurrence for mixed quantum states. The used method relies on joint measurements on two copies of an entangled state. In the experimental demonstration two polarization-entangled photon pairs emitted from spontaneous parametric down-conversion are analyzed together using a linear optics controlled phase gate. We demonstrate that the measured data, without need for further numerical processing, directly yield reliable estimates, despite experimental imperfections.
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| http://dx.doi.org/10.1103/PhysRevLett.101.260505 | DOI Listing |
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