Differential phase shift quantum private comparison

  • Authors:

  • Xing-Tong Liu;Bo Zhang;Jian Wang;Chao-Jing Tang;Jing-Jing Zhao

  • Affiliations:

  • School of Electronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China 410073;School of Electronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China 410073;School of Electronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China 410073;School of Electronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China 410073;School of Electronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China 410073

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2014

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Abstract

A novel quantum private comparison protocol based on a differential phase shift scheme is presented in this paper. In our protocol, two distrustful participants can compare the equality of information with the help of a semi-honest third party. Taking advantages of differential phase shift scheme, this protocol employs weak coherent pulses instead of single photons and can be implemented without expensive and impractical quantum devices, such as entangled photon source and quantum memory. Therefore, it is simpler and more flexible than previous protocols. Moreover, in principle, nearly 100 % qubit efficiency can be achieved because all photon counts obtained by TP contribute to the comparison. The correctness and security of the protocol are also discussed.