title: Quantum correlation of fiber-based telecom-band photon pairs through standard loss and random media.
abstract: We study quantum correlation and interference of fiber-based telecom-band photon pairs with one photon of the pair experiencing multiple scattering in a random medium. We measure joint probability of two-photon detection for signal photon in a normal channel and idler photon in a channel, which is subjected to two independent conditions: standard loss (neutral density filter) and random media. We observe that both conditions degrade the correlation of signal and idler photons, and depolarization of the idler photon in random medium can enhance two-photon interference at certain relative polarization angles. Our theoretical calculation on two-photon polarization correlation and interference as a function of mean free path is in agreement with our experiment data. We conclude that quantum correlation of a polarization-entangled photon pair is better preserved than a polarization-correlated photon pair as one photon of the pair scatters through a random medium.
authors.forename: Yong Meng
authors.initials: YM
authors.lastname: Sua
authors.forename: John
authors.initials: J
authors.lastname: Malowicki
authors.forename: Kim Fook
authors.initials: KF
authors.lastname: Lee