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Fast Quantum Private Comparison Without Keys and Entanglement

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Abstract

Nowadays, there are a lot of quantum private comparison (QPC) protocols put forward with various quantum technologies. These protocols are found to perform QPC generally deploying user-shared keys or entanglement. However, either the establishment of secret keys or the preparation of entangled states is time consuming, and also their relative devices are usually costly. In order to overcome the shortcomings, this work designs a fast QPC protocol only using single particles without keys and entanglement, allowing two users to compare the equality of their secrets under the help of two semi-honest third parties. It would be ideal for cases needing a fast and low-cost QPC, easy to implement with common quantum technologies. These traits make it an alternative way to operate QPC.

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Acknowledgements

The author Lang Yan-Feng thanks Daughter Lang Duo-Zi for her support on this work.

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

    Yan-Feng Lang

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Lang, YF. Fast Quantum Private Comparison Without Keys and Entanglement. Int J Theor Phys 61, 45 (2022). https://doi.org/10.1007/s10773-022-05033-w

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