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1 February 2019 Digital-coherent PSK Y-00 quantum stream cipher for secure fiber-optic transmission
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We present a symmetric-key direct data encryption technique utilizing signal masking by quantum noise, called Y-00 quantum stream cipher. Physical encryption of phase-shift-keying (PSK) Y-00 quantum stream cipher is achieved by our proposed extremely high-order phase modulation. Two cascaded phase modulators are driven with two synchronized digital-to-analog converters for coarse-to-fine modulations, resulting in a record 217 phase levels for the quantum noise masking. Decryption of the cipher is implemented in digital signal processing after intra-dyne coherent detection with a free-running local oscillator. We experimentally demonstrate transmission of 10-Gbaud digital-coherent PSK Y-00 cipher with 217 levels over a 240-km field-installed single-mode fiber.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ken Tanizawa and Fumio Futami "Digital-coherent PSK Y-00 quantum stream cipher for secure fiber-optic transmission", Proc. SPIE 10946, Metro and Data Center Optical Networks and Short-Reach Links II, 109460B (1 February 2019);

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