Experimental observation of four-photon entanglement from down-conversion

Details Experimental observation of four-photon entanglement from down-conversion Experimental observation of four-photon entanglement from down-conversion

2003-02-05

arxiv.org/abs/quant-ph/0302042v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.200403

We observe polarization-entanglement between four photons produced from a single down-conversion source. The non-classical correlations between the measurement results violate a generalized Bell inequality for four qubits. The characteristic properties and its easy generation with high interferometric contrast make the observed four-photon state well-suited for implementing advanced quantum communication schemes such as multi-party quantum key distribution, secret sharing and telecloning.

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