We report an original all-optical synchronization scheme suitable for a quantum relay based experiments at telecom wavelengths. After discussing the entangled photon sources’ performances, we validate our scheme by performing a two-photon interference at the relay station.
We discuss the hybrid integration of multiple components for the production of telecom band single photon sources. We implement four, on-chip, waveguide channels capable of producing four spatially separated collinear pairs of single photons. Using laser inscribed waveguide circuits and point-by-point bre Bragg gratings (FBG), we interface, separate and lter generated photon pairs. We propose using fast switches to actively route multiple heralded single photons to a single output producing an enhanced rate while maintaining a xed noise level.
Periodically poled lithium niobate waveguides (PPLN/W) are considered to be one of the most useful toolboxes for
enabling quantum communication experiments. Thanks to the high optical confinement over longer lengths than in bulk
configurations (a few cm in our case), such structures provide highly efficient non-linear interactions, i.e., in parametric
downconversion, or sum and difference frequency generation regimes. Within the framework of long-distance quantum
communication at telecom wavelengths, PPLN/Ws have therefore been proved to be a key ingredient for building ultrabright
sources of time-bin, as well as polarization entangled photons, and for photonic quantum interfaces providing
coherent wavelength conversions from telecom to visible wavelength range, and conversely. During the presentation, we
will discuss some recent experimental advances regarding polarization entanglement sources and quantum interfaces.
We report on a guided wave asynchronous heralded photon source based on the creation of non-degenerate photon pairs by spontaneous parametric down conversion in a Periodically Poled Lithium Niobate waveguide. We show that using the signal photon at 1310\nm as a trigger, a gated detection process permits announcing the arrival of single photons at 1550nm at the output of a single mode optical fiber with a high probability of 0.37. At the same time the multi-photon emission probability is reduced by a factor of 10 compared to poissonian light sources.