Interaction-free measurement based on nonclassical fourth-order interference
Tae-Gon Noh, C. K. Hong · Quantum and Semiclassical Optics Journal of the European Optical Society Part B · 1998
A new method of interaction-free measurement using a two-photon state is proposed. The scheme is an extension of Elitzur-Vaidman's original idea from a single-particle to a multiparticle case. It is also pointed out that the present proposal cannot be explained within the framework of classical wave theory.