A two-step quantum secure direct communication protocol with hyperentanglement

We propose a two-step quantum secure direct communication （QSDC） protocol with hyperentanglement in both the spatial-mode and the polarization degrees of freedom of photon pairs which can in principle be produced with a beta barium borate crystal. The secret message can be encoded on the photon pair...

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Bibliographic Details
Published in:Chinese physics B 2011-10, Vol.20 (10), p.66-70
Main Authors: Gu, Bin (斌顾), Huang, Yu-Gai (余改 黄), Fang, Xia (夏方), Zhang, Cheng-Yi (成义 张)
Format: Article
Language:English
Subjects:
Beta
Crystals
Degrees of freedom
Horses
Mathematical analysis
Messages
Photons
Strategy
偏振度
光子对
攻击策略
特洛伊木马
编码
自由
通信协议
量子安全直接通信
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Summary:We propose a two-step quantum secure direct communication （QSDC） protocol with hyperentanglement in both the spatial-mode and the polarization degrees of freedom of photon pairs which can in principle be produced with a beta barium borate crystal. The secret message can be encoded on the photon pairs with unitary operations in these two degrees of freedom independently. This QSDC protocol has a higher capacity than the original two-step QSDC protocol as each photon pair can carry 4 bits of information. Compared with the QSDC protocol based on hyperdense coding, this QSDC protocol has the immunity to Trojan horse attack strategies with the process for determining the number of the photons in each quantum signal as it is a one-way quantum communication protocol.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/10/100309