Past-Future Interference in $\mathrm{\Phi }$-Decays into Entangled Kaon Pairs

Quantum interference effects between past and future events (neutral kaon transitions, including CP violating decays) are discussed for entangled kaon pairs produced through $\varphi \to K^0\overline{K^0}$ in $\varphi$-factories. Contrasting with the exciting conclusions of other recent analyses, we predict the inexistence of such an observable effect.