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Conference on Lasers and Electro-Optics

Practical Nonlocal Dispersion Compensation of O-band Entangled Photons over 20 km Deployed Metropolitan Fiber

James A. Grieve, Chua Rui Ming, Yicheng Shi, Hou Shun Poh, Christian Kurtsiefer, Alexander Ling

Published Jan 1, 2020• 0 citations
Publisher

Abstract

Time-energy entangled photon pairs experience nonlocal dispersion compensation after propagation over multi-segment deployed telecommunications fiber. The preservation of tight timing correlations enables the use of broadband quantum light sources in existing metropolitan fiber networks.
DOI
10.1364/cleo_at.2020.atu3s.6

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Nonlocal dispersion compensation facilitated over standard ITU-T G.652/7 telecommunication fiber provides the simplest solution for the preservation of pair-wise timing correlations of broadband spontaneous parametric down converted photons. Its reliance on key parameters such as the relative spectral property of the down converted photons and pump wavelength were studied, providing important insights for an effective use of this scheme. We also raise the benefit of using modern ITU-T G.655 telecommunication fiber to complement this scheme. We preserved the timing correlations of photons distributed over a cumulative distance of 40km to within 60ps, with only 2km of extra G.655 fiber.
Abstract Quantum key distribution (QKD) enables unconditionally secure communication guaranteed by the laws of physics. The last decades have seen tremendous efforts in making this technology feasible under real-life conditions, with implementations bridging ever longer distances and creating ever higher secure key rates. Readily deployed glass fiber connections are a natural choice for distributing the single photons necessary for QKD both in intra- and intercity links. Any fiber-based implementation however experiences chromatic dispersion which deteriorates temporal detection precision. This ultimately limits maximum distance and achievable key rate of such QKD systems. In this work, we address this limitation to both maximum distance and key rate and present an effective and easy-to-implement method to overcome chromatic dispersion effects. By exploiting entangled photons’ frequency correlations, we make use of nonlocal dispersion compensation to improve the photons’ temporal correlations. Our experiment is the first implementation utilizing the inherently quantum-mechanical effect of nonlocal dispersion compensation for QKD in this way. We experimentally show an increase in key rate from 6.1 to 228.3 bits/s over 6.46 km of telecom fiber. Our approach is extendable to arbitrary fiber lengths and dispersion values, resulting in substantially increased key rates and even enabling QKD in the first place where strong dispersion would otherwise frustrate key extraction at all.