基于Bell态纠缠交换的量子私密比较方案

摘要/Abstract

摘要： 提出了一种新的量子私密比较方案，该方案以Bell态为量子资源，在不泄露用户私密信息的前提下，利用Bell测量和纠缠变换实现对用户的信息相等与否的比对。第三方（TP）准备Bell态和诱饵单光子，在传送粒子过程中，TP插入诱饵单光子，通过经典信道的讨论保证了方案的安全性。用户双方不需要做任何幺正变换，只需执行Bell测量，随后将自己的私密信息加密后发送给第三方。第三方通过简单的计算就可以实现两比特经典信息的比对。整个过程中所涉及到的三方都无法得知他人的私密信息，只能得到比对结果。最后,由TP宣布比较结果。此外，我们也验证了方案的正确性。

关键词: 量子信息, 量子私密比较, Bell测量, 纠缠交换, 高安全性

Abstract: A new quantum private comparison (QPC) protocol using Bell states and Bell entanglement swapping is proposed and analyzed. In the proposed protocol, we utilize Bell states as the quantum resources, and further perform Bell measurements and entanglement swapping as the main operations for dealing with the private comparison of equal information without revealing their information content. TP prepares Bell states and decoy photons, he inserts decoy photons to sequences which he want to send to users for security. Users don’t require to do any local unitary operations and only need to perform Bell measurements, then they send their sequences after they coding their private information respectively. TP can achieve the comparison of two bits of classical information by simple calculation. Finally, TP announced the result of the comparison. In addition, the correctness and security of our protocol are discussed.

Key words: quantum information, quantum private comparison, Bell measurements, entanglement swapping, security

中图分类号:

0431

孙新梅查新未李宁. 基于Bell态纠缠交换的量子私密比较方案[J]. J4, 2013, 30(5): 579-585.

SUN Xin-mei, ZHA Xin-wei, LI Ning. Scheme of quantum private comparison via Bell states and Bell entanglement swapping[J]. J4, 2013, 30(5): 579-585.

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