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Optical Fiber Technology

A novel realization of quantum stream cipher with key-modulated local light

Haisong Jiao, Tao Pu, Lei Shi, Yukai Chen, Longqiang Yu

Published Sep 6, 2019• 4 citations
Publisher
DOI
10.1016/j.yofte.2019.102007

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The Y-00 quantum stream cipher utilizes the effect of quantum noise on optical signals and realizes signal-level symmetric-key encryption to protect interception in optical communication. A transceiver architecture that disaggregates encryption/decryption and modulation/demodulation in the optical domain facilitates the migration of Y-00 cipher to current digital-coherent communication systems. This paper presents a polarization-diversity intradyne Y-00 coherent receiver where local oscillator light is modulated for decryption. Polarization-diversity optical decryption and detection are simultaneously achieved using a typical optical 90-degree hybrid circuit and a conventional polarization-sensitive electro-optic modulator. Penalty-less detection with the decryption is demonstrated in 5-Gbit/s PSK Y-00 cipher transmission over fiber and free-space links, facilitating the disaggregation of decryption and demodulation.