Digital-coherent PSK Y-00 quantum stream cipher for secure fiber-optic transmission

Ken Tanizawa; Fumio Futami

doi:10.1117/12.2506835

1 February 2019 Digital-coherent PSK Y-00 quantum stream cipher for secure fiber-optic transmission

Ken Tanizawa, Fumio Futami

Proceedings Volume 10946, Metro and Data Center Optical Networks and Short-Reach Links II; 109460B (2019) https://doi.org/10.1117/12.2506835
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.2506835

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