Experimental Realization of Entanglement Concentration and A Quantum Repeater

Details Experimental Realization of Entanglement Concentration and A Quantum Repeater Experimental Realization of Entanglement Concentration and A Quantum Repeater

2003-01-22

arxiv.org/abs/quant-ph/0301118v1

Physics

Quantum Physics

15 pages, 4 figures, submitted

Scientific paper

10.1103/PhysRevLett.90.207901

We report an experimental realization of entanglement concentration using two polarization-entangled photon pairs produced by pulsed parametric down-conversion. In the meantime, our setup also provides a proof-in-principle demonstration of a quantum repeater. The quality of our procedure is verified by observing a violation of Bell's inequality by more than 5 standard deviations. The high experimental accuracy achieved in the experiment implies that the requirement of tolerable error rate in multi-stage realization of quantum repeaters can be fulfilled, hence providing a practical toolbox for quantum communication over large distances.

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