Generation of 1.5-um band time-bin entanglement using spontaneous fiber four-wave mixing and planar lightwave circuit interferometers

摘要

This paper reports 1.5-um band time-bin entanglement generation. We employeda spontaneous four-wave mixing process in a dispersion shifted fiber, withwhich correlated photon pairs with very narrow bandwidths were generatedefficiently. To observe two-photon interference, we used planar lightwavecircuit based interferometers that were operated stably without feedbackcontrol. As a result, we obtained coincidence fringes with 99 % visibilitiesafter subtracting accidental coincidences, and successfully distributedentangled photons over 20-km standard single-mode fiber without anydeterioration in the quantum correlation.