Recently, Yang et al. suggested a semi-quantum private query (SQPQ) protocol (Quantum Inf Process (2015)14:1017) using one quantum state. Later, Yu et al. (Quantum Inf Process (2015)14:4201) pointed out that Yang et al.’s SQPQ protocol runs the risk of user privacy being invaded, i.e., the database owner can manipulate the conclusiveness of bits definitely by launching a special kind of fake initial state attack, and then constructed an improved quantum private query (QPQ) protocol to avoid this risk. However, Yu et al.’s QPQ protocol is not semi-quantum. In this paper, we successfully design the SQPQ protocol without running the risk of user privacy being invaded. The proposed SQPQ protocol has the following features: (1) it only employs one kind of quantum state as the initial quantum state; (2) it doesn’t require the classical user to perform the measurement operation; and (3) it is cheat-sensitive, which means that if the database privacy or the user privacy is invaded, the attack behavior can be detected.

中文翻译：

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不调用经典用户测量能力的半量子私有查询协议

最近，杨等人。建议使用一种量子状态的半量子私有查询 (SQPQ) 协议 (Quantum Inf Process (2015)14:1017)。后来，Yu 等人。(Quantum Inf Process (2015)14:4201) 指出，Yang 等人的 SQPQ 协议存在用户隐私被侵犯的风险，即数据库所有者可以通过发起一种特殊的伪造来肯定地操纵比特的结论性初始状态攻击，然后构造改进的量子私有查询（QPQ）协议来避免这种风险。但是，Yu 等人的 QPQ 协议不是半量子协议。在本文中，我们成功地设计了 SQPQ 协议，而不会冒用户隐私被侵犯的风险。提出的 SQPQ 协议具有以下特点： (1) 仅采用一种量子态作为初始量子态；(2)不需要经典用户进行测量操作；(3) 对作弊敏感，这意味着如果数据库隐私或用户隐私被侵犯，攻击行为可以被检测到。