Differential phase shift quantum private comparison

作者：Liu, Xing-tong^*; Zhang, Bo; Wang, Jian; Tang, Chao-jing; Zhao, Jing-jing

来源：Quantum Information Processing, 2014, 13(1): 71-84.

DOI：10.1007/s11128-013-0708-4

• Quantum private comparison
• Differential phase shift
• Weak coherent pulse
• Qubit efficiency

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.

• 出版日期2014-1
• 单位中国人民解放军国防科学技术大学