title: Optimal coupling of entangled photons into single-mode optical fibers.
abstract: We present a consistent multimode theory that describes the coupling of single photons generated by collinear Type-I parametric downconversion into single-mode optical fibers. We have calculated an analytic expression for the fiber diameter which maximizes the pair photon count rate. For a given focal length and wavelength, a lower limit of the fiber diameter for satisfactory coupling is obtained.
authors.forename: Roger
authors.initials: R
authors.lastname: Andrews
authors.forename: E
authors.initials: E
authors.lastname: Pike
authors.forename: Sarben
authors.initials: S
authors.lastname: Sarkar