Skip to content

Experimental observation of four-photon entanglement from down-conversion

M. Eibl, S. Gaertner, M. Bourennane, Ch. Kurtsiefer, M. Zukowski, H. Weinfurter

quant-pharXiv:quant-ph/0302042

Abstract

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.

Create a lesson