Abstract
A simple plug-and-play quantum key distribution scheme based on the Sagnac interferometer and Faraday mirrors is described. There are relatively few components, and fiber birefringence effects are automatically compensated for, allowing extremely stable operation. Visibility better than 95% over 50 km of fiber at 1.31 μm is obtained, maintainable under ordinary lab conditions for several hours without the need of any feedback control or adjustments.
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