Incorporating single photon links used for quantum communication applications like quantum key distribution is a challenging task. Direct contamination from the strong classical signal and induced Raman scattering easily obscures the weak quantum signal. Generating entangled photons in the O-band might allow the coexistence of classical and quantum signals. We present results demonstrating the feasibility of transmitting entangled photons and strong classical communication signals over the same fiber.
Florian Hipp, Michael Hentschel, Slavisa Aleksic, Andreas Poppe, and Hannes Huebel, "Demonstration of a coexistence scheme between polarization-entangled QKD and classical data channels," Proc. SPIE 9900, Quantum Optics, 99000P (Presented at SPIE Photonics Europe: April 07, 2016; Published: 29 April 2016); https://doi.org/10.1117/12.2230222.
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