ABSTRACT
A thin-film periodically poled lithium niobate waveguide was designed and fabricated which generates entangled photon pairs at telecommunications wavelengths with high coincidences-to-accidentals counts ratio CAR>67000, two-photon interference visibility V>99%, and heralded single-photon autocorrelation g_{H}^{(2)}(0)<0.025. Nondestructive in situ diagnostics were used to determine the poling quality in 3D. Megahertz rates of photon pairs were generated by less than a milliwatt of pump power, simplifying the pump requirements and dissipation compared to traditional spontaneous parametric down-conversion lithium niobate devices.
ABSTRACT
A fraction of a classical 10 Gigabits-per-second, non-return-to-zero data stream at 1.55 micron wavelengths from a standard telecommunications optical transceiver was tapped and used to generate photon-pairs and heralded single photons using a silicon microring resonator at room temperature. These results show that there may be no need for a separate laser to generate high-quality photon pairs for quantum applications in a typical optical communications network.
