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Conference on Lasers and Electro-Optics

Generation of Time-Bin Entangled Photon Pairs Using Cascaded Second Order Nonlinearity in Single Periodically-Poled Lithium Niobate Waveguide

Myrtille O. J. Y. Hunault, Hiroki Takesue, Osamu Tadanaga, Y. Nishida, Masaki Asobe

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We report a simple scheme to generate time-bin entangled photon pairs based on cascaded second-order nonlinear processes in a single periodically-poled lithium niobate waveguide. We successfully observed two-photon interference fringes up to 97% visibilities.
DOI
10.1364/qels.2010.qthg4

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Entangled photon pairs are one of the most important resources for the development of quantum communication technologies. In order to produce pulsed photon pairs in the telecommunication band from 1.5 mum pump light, most of the previous experiments used two successive periodically poled lithium niobate (PPLN) waveguides. We report what we believe to be a new method using cascaded second-order nonlinearity in a single PPLN waveguide to produce high-purity time-bin entangled photon pairs. We confirmed the generation of entanglement through a two-photon interference experiment showing a coincidence fringe with a visibility of up to 97%.
By using cascaded second-order nonlinear optical processes in a piece of periodically poled lithium niobate waveguide, we generate 1.5 μ\muμ m discrete frequency-bin entangled two-photon state with a spatial quantum beating visibility of 93.0 ± 5.2%.
Abstract In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO 3 (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e., second-harmonic generation (SHG) and spontaneous parametric downconversion (SPDC), to generate photon-pairs. Previously, the performance of the photon-pairs is contaminated by Raman noise photons. Here by fiber-integrating the PPLN waveguide with noise-rejecting filters, we obtain a coincidence-to-accidental ratio (CAR) higher than 52,600 with photon-pair generation and detection rate of 52.36 kHz and 3.51 kHz, respectively. Energy-time, frequency-bin, and time-bin entanglement is prepared by coherently superposing correlated two-photon states in these degrees of freedom, respectively. The energy-time entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.71 ± 0.02 with two-photon interference visibility of 95.74 ± 0.86%. The frequency-bin entangled two-photon states achieve fidelity of 97.56 ± 1.79% with a spatial quantum beating visibility of 96.85 ± 2.46%. The time-bin entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.60 ± 0.04 and quantum tomographic fidelity of 89.07 ± 4.35%. Our results provide a potential candidate for the quantum light source in quantum photonics.