With the rapid development of computer-related technology, how to realize privacy query between both parties becomes very important. In this paper, we propose a quantum privacy query protocol based on W state, compared with the GHZ state, the W state is more robust and easier to prepare, the quantum circuit for preparing W state is also given. The protocol makes use of the correlation after entangled state measurement, and enables the querying party to obtain only one secret key information with the assistance of a third party, thus compared with existing schemes, this scheme eliminates the need for classic post-processing operations and can resist joint measurement attacks. In addition, the proposed protocol has two security checks, which can well resist ancilla particle attacks and entanglement measurement attacks by third parties and external intruders participating in the protocol. Therefore, the proposal of this protocol is very necessary.

中文翻译：

---

使用 W 状态的量子私有查询

随着计算机相关技术的飞速发展，如何实现双方之间的隐私查询变得非常重要。在本文中，我们提出了一种基于W态的量子隐私查询协议，与GHZ态相比，W态更健壮，更容易准备，还给出了准备W态的量子电路。该协议利用纠缠态测量后的相关性，使查询方在第三方的协助下只获得一个密钥信息，与现有方案相比，该方案省去了经典的后处理操作，可以抵抗联合测量攻击。此外，提议的协议有两个安全检查，可以很好地抵抗第三方和参与协议的外部入侵者的辅助粒子攻击和纠缠测量攻击。因此，本议定书的提出是非常必要的。