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一种基于迈克耳逊干涉仪的单向量子密钥分发系统,采用法拉第旋转镜和四端口偏振分束器的组合,消除了光纤及光学器件的双折射效应,具有自稳定特性。信息编码在光子的相位上,通过检测光子的偏振进而解码出信息。以中心波长1310nm的单光子脉冲,在50km的干线光纤中获得了30dB的消光比。
A one-way quantum key distribution system based on Michelson interferometer uses a combination of a Faraday rotating mirror and a four-port polarization beam splitter to eliminate the birefringence effect of the optical fiber and the optical device and has self-stability characteristics. The information is encoded in the photon phase and decoded by detecting the polarization of photons. With a single-photon pulse at a center wavelength of 1310 nm, an extinction ratio of 30 dB was obtained at 50 km of trunk fiber.