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Quantum Gate-Based Quantum Private Comparison

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Abstract

Many existing protocols of quantum private comparison (QPC) are often made up of quantum part and classical part, because they employ quantum technology to provide security and use classical computation to perform the comparison. This could result in some lurking unfavourable effects such as insufficient security. To improve the QPC security, the paper presents a QPC protocol without the classical part, which uses Bell states as the quantum resource and substitutes the action of quantum gate for the classical computation. It needs no other complex quantum operations including quantum entanglement swapping technology. Except the phase of the eavesdropping check, quantum measurement isn’t required at one party either. The presented protocol is not only simple and efficient but also of better security. The analyses indicate its correctness so it could serve as an alternative way to implement QPC.

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Acknowledgements

The author Lang Yan-Feng thanks Daughter Lang Duo-Zi for her support on this work. Funding by General Research Project of Department of Education of Zhejiang Province (Grant No.Y201840249) and Research Project of Department of Water Resources of Zhejiang Province (Grant No.RC1861) is gratefully acknowledged.

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  1. School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, People’s Republic of China

    Yan-Feng Lang

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Lang, YF. Quantum Gate-Based Quantum Private Comparison. Int J Theor Phys 59, 833–840 (2020). https://doi.org/10.1007/s10773-019-04369-0

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