An analysis is made of the results of a recent polarization correlation experiment by Bovino (unpublished) where about 60,000 data have been obtained. I assume that the state of the photon pairs produced in the source (a non-linear crystal) are in a (sligh
absorptions,asexplainedabove,thereisaglobalfactor
µa(Ta++ta+)ζa+µb(Tb++tb+)ζb+
infrontofP++andsimilarlyforP+ ,P +andP .Inadditioneverycos2αorsin2αshouldbeprecededbyeitherafactor(Ta+ ta+)/(Ta++ta+)orafactor(Ta ta )/(Ta +ta )(seeeqs.(4))andsimilarly,witha→b,forcosβorsinβ.ThusIget
P++=1
4ηa+ηb [1+V+ cos2φ γ′(cos2β+cos2α) γ′′sin2αsin2β],
P1 +=
4ηa ηb [1 V cos2φ γ′(cos2β cos2α)+γ′′sin2αsin2β(6)],
where
φ≡α β,γ′≡2γ+γ2
2+2γ+γ2,ηa+≡µaTa+ζa+,
andsimilarlyfortheremainingparametersη.ThetermV++isgivenby
V(Ta+ ta+)(Tb+ tb+)++=
1
2ηa+[1 γ′cos2α],Pa =
2ηb+[1+γ′cos2β],Pb =1