Quantum Secure Direct Communication by Using Three-Dimensional Hyperentanglement

We propose two schemes for realizing quantum secure direct communication （QSDC） by using a set of ordered two-photon three-dimensional hyperentangled states entangled in two degrees of freedom （DOFs） as quantum information channels. In the first scheme, the photons from Bob to Alice are transmitted...

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Bibliographic Details
Published in:Communications in theoretical physics 2011-11, Vol.56 (11), p.831-836
Main Author: 施锦 龚彦晓 徐平 祝世宁 詹佑邦
Format: Article
Language:English
Subjects:
Bells
Channels
Computer information security
Degrees of freedom
Mathematical analysis
Messages
Photons
Three dimensional
三维
光子传输
双光子
子秘密
自由度
量子信息
量子安全直接通信
量子通道
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Summary:We propose two schemes for realizing quantum secure direct communication （QSDC） by using a set of ordered two-photon three-dimensional hyperentangled states entangled in two degrees of freedom （DOFs） as quantum information channels. In the first scheme, the photons from Bob to Alice are transmitted only once. After insuring the security of the quantum channels, Bob encodes the secret message on his photons. Then Alice performs single-photon two-DOF Bell bases measurements on her photons. This scheme has better security than former QSDC protocols. In the second scheme, Bob transmits photons to Alice twice. After insuring the security of the quantum channels, Bob encodes the secret message on his photons. Then Alice performs two-photon Bell bases measurements on each DOF. The scheme has more information capacity than former Q,SDC protocols.
ISSN:0253-6102
DOI:10.1088/0253-6102/56/5/08