  We demonstrate a bright and polarized fiber in-line single photon source
based on plasmon-enhanced emission of colloidal single quantum dots into an
optical nanofiber. We show that emission properties of single quantum dots can
be strongly enhanced in the presence of single gold nanorods leading to a
bright and strongly polarized single photon emission. The single photons are
efficiently coupled to guided modes of the nanofiber and eventually to a single
mode optical fiber. The brightness (fiber-coupled photon count rate) of the
single photon source is estimated to be 12.2(0.6) MHz, with high single photon
purity (g2(0) = 0.20(0.04)) and degree of polarization as high as 94-97%. The
present device can be integrated into fiber networks paving the way for
potential applications in quantum networks.
