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Integrated Silicon Photonic Transmitter for Polarization-Encoded Quantum Key Distribution
Chaoxuan Ma, W. Sacher, Zhiyuan Tang, J. Mikkelsen, Yisu Yang, Feihu Xu, H. Lo, J. Poon·June 14, 2016
PhysicsMathematics
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Abstract
We present a silicon optical transmitter for polarization-encoded quantum key distribution (QKD). The chip was fabricated in a standard silicon photonic foundry process and integrated a pulse generator, intensity modulator, variable optical attenuator, and polarization modulator in a 1.3 mm $\times$ 3 mm die area. The devices in the photonic circuit meet the requirements for QKD. The transmitter was used in a proof-of-concept demonstration of the BB84 QKD protocol over a 5 km long fiber link.