中国物理B ›› 2011, Vol. 20 ›› Issue (10): 100309-100309.doi: 10.1088/1674-1056/20/10/100309

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A two-step quantum secure direct communication protocol with hyperentanglement

顾斌1, 张成义1, 黄余改2, 方夏2   

  1. (1)College of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China; The Photonic Technology Laboratory, Nanjing University of Information Science and Technology, Nanjing 210044, China; (2)Jiangsu Institute of Education, Nanjing 210013, China
  • 收稿日期:2011-04-26 修回日期:2011-05-20 出版日期:2011-10-15 发布日期:2011-10-15
  • 基金资助:
    Project supported by the Natural Science Foundation of Jiangsu Provincial Universities, China (Grant No. 10KJB180004).

A two-step quantum secure direct communication protocol with hyperentanglement

Gu Bin(顾斌)a)b)†, Huang Yu-Gai(黄余改) c), Fang Xia(方夏)c), and Zhang Cheng-Yi(张成义)a)b)   

  1. a College of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, Chinab The Photonic Technology Laboratory, Nanjing University of Information Science and Technology, Nanjing 210044, China; c Jiangsu Institute of Education, Nanjing 210013, China
  • Received:2011-04-26 Revised:2011-05-20 Online:2011-10-15 Published:2011-10-15
  • Supported by:
    Project supported by the Natural Science Foundation of Jiangsu Provincial Universities, China (Grant No. 10KJB180004).

摘要: 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.

关键词: quantum secure direct communication, two-step, hyperentanglement, high capacity

Abstract: 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.

Key words: quantum secure direct communication, two-step, hyperentanglement, high capacity

中图分类号:  (Quantum communication)

  • 03.67.Hk
03.67.Dd (Quantum cryptography and communication security)