Experimental observation of four-photon entanglement from parametric down-conversion |
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| Authors: | Eibl Manfred Gaertner Sascha Bourennane Mohamed Kurtsiefer Christian Zukowski Marek Weinfurter Harald |
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| Affiliation: | Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany. |
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| Abstract: | We observe polarization entanglement between four photons produced from a single down-conversion source. The nonclassical 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 multiparty quantum key distribution, secret sharing, and telecloning. |
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