We present the first observation of two-photon polarization interference structure in the second-order Glauber correlation function of two-photon light generated via type-II spontaneous parametric down-conversion. In order to obtain this result, two-photon light is transmitted through an optical fiber and the coincidence distribution is analyzed by means of the start-stop method. Beyond the experimental demonstration of an interesting effect in quantum optics, these results also have considerable relevance for quantum communications.
Dispersion Spreading of Biphotons in Optical Fibers and Two-Photon Interference / BRIDA G; CHEKHOVA M.V; GENOVESE M; GRAMEGNA M; KRIVITSKY L.A. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 96:14(2006), pp. 143601-143604. [10.1103/PhysRevLett.96.143601]