Entanglement formation and violation of Bell's inequality with a semiconductor single photon source

Details Entanglement formation and violation of Bell's inequality with a semiconductor single photon source Entanglement formation and violation of Bell's inequality with a semiconductor single photon source

2003-05-09

arxiv.org/abs/quant-ph/0305048v1

Physics

Quantum Physics

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.92.037903

We report the generation of polarization-entangled photons, using a quantum dot single photon source, linear optics and photodetectors. Two photons created independently are observed to violate Bell's inequality. The density matrix describing the polarization state of the postselected photon pairs is also reconstructed, and agrees well with a simple model predicting the quality of entanglement from the known parameters of the single photon source. Our scheme provides a method to generate no more than one entangled photon pair per cycle, a feature useful to enhance quantum cryptography protocols using entangled photons.

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