QAM Quantum Noise Stream Cipher Transmission over 100 km with Continuous Variable Quantum Key Distribution

Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai, Takuya Hirano, Tsubasa Ichikawa, Ryo Namiki

研究成果: Article査読

39 被引用数 (Scopus)

抄録

We report the first on-line high-speed and large-capacity secure optical communication system. This was realized by combining a quadrature amplitude modulation/quantum noise stream cipher technology where a coherent multi-level optical signal is hidden in quantum noise and a quantum key distribution technology where secure key delivery is realized with an extremely weak laser light comparable to a single photon. In our security analysis, we adopt a realistic assumption, namely, that an adversary does not have a lossless fiber. To show the advantage of this scheme, we performed a 128 QAM, 70-Gbit/s single-channel transmission over 100 km with a spectral efficiency of as high as 10.3 bits/s/Hz. This is the fastest data rate and highest spectral efficiency yet achieved in quantum cryptography with a realistic assumption.

本文言語English
論文番号7933953
ジャーナルIEEE Journal of Quantum Electronics
53
4
DOI
出版ステータスPublished - 2017 8

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 凝縮系物理学
  • 電子工学および電気工学

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