Physics – Quantum Physics
Scientific paper
1999-07-09
Opt.Commun. 142 (1997) 308-314
Physics
Quantum Physics
RevTeX, 20 pages, 2figures, Author's URL http://m3k.grad.hr/pavicic
Scientific paper
10.1016/S0030-4018(97)00285-X
A method for preparing a loophole-free four-photon Bell experiments which requires a detection efficiency of 67% is proposed. It enables realistic detection efficiencies of 75% at a visibility of 85%. Two type-II crystals each down convert one correlated photon pair and we entangle one photon from one pair with one photon from the other pair on a highly transparent beam splitter. The entanglement selects two other conjugate photons into a Bell state. Wide solid angles for the conjugate photons then enable us to collect close to 100% of them. The cases when both photon pairs come from only one of the two crystals are successfully taken into account. Hardy's equalities are discussed.
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