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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 4098–4107

QAM quantum stream cipher using digital coherent optical transmission

Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka, and Keisuke Kasai  »View Author Affiliations


Optics Express, Vol. 22, Issue 4, pp. 4098-4107 (2014)
http://dx.doi.org/10.1364/OE.22.004098


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Abstract

A Quantum Stream Cipher (QSC) using Quadrature Amplitude Modulation (QAM) is presented to greatly increase the secure degree compared with ASK or PSK/QSC. We propose encoding multi-bit data in one symbol with a multi-bit basis state, resulting in QAM/QSC, which employs amplitude and phase encryption of the light beam simultaneously. A 16 QAM/QSC experiment at 10 Gbit/s was successfully carried out over 160 km using a digital coherent optical transmission technique, where 16 QAM data were encrypted in a constellation with 32 × 32~4096 × 4096 symbols. We show experimentally that the Number of Masked Signals (NMS) in the quantum noise ΓQAM for QAM/QSC becomes a square multiple larger than ΓASK for ASK/QSC. ΓQAM exceeds 10,000. This result indicates that the QSC technique is more robust against eavesdroppers than ASK or PSK/QSC.

© 2014 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4785) Fiber optics and optical communications : Optical security and encryption
(060.5565) Fiber optics and optical communications : Quantum communications

ToC Category:
Optical Communications

History
Original Manuscript: December 27, 2013
Revised Manuscript: February 10, 2014
Manuscript Accepted: February 11, 2014
Published: February 13, 2014

Citation
Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka, and Keisuke Kasai, "QAM quantum stream cipher using digital coherent optical transmission," Opt. Express 22, 4098-4107 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-4-4098


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