Acta Metallurgica Sinica(English letters) ›› 2009, Vol. 16 ›› Issue (3): 114-121.doi: 10.1016/S1005-8885(08)60236-8

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Two-step unsymmetrical quantum key distribution protocol using GHZ triplet states

HUANG Peng, LIU Ye, ZHOU Nan-run, ZENG Gui-hua   

  1. Department of Electronic Information Engineering, Nanchang University, Nanchang 330031, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-06-30
  • Contact: HUANG Peng

Abstract:

The security, efficiency, transmission distance and error rate are important parameters of a quantum key distribution scheme. In this article, the former two parameters are focused on. To reach high efficiency, an unsymmetrical quantum key distribution scheme that employs Greenberger-Horne-Zeilinger (GHZ) triplet states and dense coding mechanism is proposed, in which a GHZ triplet state can be used to share two bits of classical information. The proposed scheme can be employed in a noisy or lossy quantum channel. In addition, a general approach to security analysis against general individual attacks is presented.

Key words:

two-step;unsymmetrical quantum key distribution;GHZ triplet states