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PPLN waveguide for quantum communication

DeMicheli, M.
Ostrowsky, D. B.
Published in The European Physical Journal. D, Atomic, Molecular and Optical Physics. 2002, vol. 18, no. 2, p. 155-160
Abstract We report on energy-time and time-bin entangled photon-pair sources based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons at 1314 nm wavelength are created by spontaneous parametric down-conversion and coupled into standard telecom fibers. Our PPLN waveguide features a very high conversion efficiency of about 10^(-6), roughly 4 orders of magnitude more than that obtained employing bulk crystals. Even if using low power laser diodes, this engenders a significant probability for creating two pairs at a time - an important advantage for some quantum communication protocols. We point out a simple means to characterize the pair creation probability in case of a pulsed pump. To investigate the quality of the entangled states, we perform photon-pair interference experiments, leading to visibilities of 97% for the case of energy-time entanglement and of 84% for the case of time-bin entanglement. Although the last figure must still be improved, these tests demonstrate the high potential of PPLN waveguide based sources to become a key element for future quantum communication schemes
Keywords Nonlinear waveguidesEntanglement and quantum nonlocalityQuantum communication
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TANZILLI, Jean-Sébastien et al. PPLN waveguide for quantum communication. In: The European Physical Journal. D, Atomic, Molecular and Optical Physics, 2002, vol. 18, n° 2, p. 155-160. https://archive-ouverte.unige.ch/unige:36818

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Deposited on : 2014-05-20

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