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Japanese Journal of Applied Physics

Single-Photon Source for Telecommunication Wavelengths Using Nondegenerate Photon Pairs from a Periodically Poled LiNbO3 Waveguide

Naoto Namekata, Shigehiko Mori, Shuichiro Inoue

Published Jun 1, 2007• 3 citations
Publisher

Abstract

We report on single-photon generation at an optical telecommunication wavelength using nondegenerate photon pairs generated by a periodically poled lithium niobate waveguide and a conventional single-photon detector. The probability that a single photon was present was 0.16, and the second-order correlation function was 0.19. In addition, the photon statistics of the photon source were studied.

DOI
10.1143/jjap.46.3410

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We report on single-photon generation at an optical telecommunication wavelength using nondegenerate photon pairs generated by a periodically poled lithium niobate waveguide and a conventional single-photon detector. The probability that a single photon was present was 0.16, and the second-order correlation function was 0.19. In addition, the photon statistics of the photon source were studied.
We report on the generation of narrowband photon pairs at telecommunication wavelengths using a periodically poled lithium niobate waveguide that utilizes the nonlinear tensor element d(24) for type-II quasi phase matching. The FWHM bandwidth of the spontaneous parametric downconversion was 1 nm. The brightness of the photon pair source was ~6x10(5)/s/GHz when the pump power was 1 mW. The indistinguishability of the signal and idler photons generated by the degenerate spontaneous parametric downconversion process was studied in a Hong-Ou-Mandel type interference experiment.
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We report on a new kind of correlated photon-pair source based on a waveguide integrated on a Periodically Poled Lithium Niobate substrate. Using a pump laser of a few micro-Watts at 657 nm, we generate degenerate photon-pairs at 1314 nm. Detecting about 1500 coincidences per second, we can infer a conversion rate of 10-6 pairs per pump photon, which is four orders of magnitude higher than that obtained with previous bulk sources. These results are very promising for the realization of sources for quantum communication and quantum metrology experiments requiring a high signal-to-noise ratio or working with more than one photon-pair at a time.
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.