实验性量子专用线性光学系统
Experimental Quantum Private Queries with linear optics
摘要：
量子私有查询是一种量子加密协议，用于从数据库中恢复信息，同时保护用户和数据隐私：用户可以测试是否有人保留了询问的信息，数据库提供商可以测试释放的信息量。在这里，我们介绍了一个新的变种量子私有查询算法，它允许一个简单的线性光学实现：它采用光子的动量（或时隙）作为地址量子比特和它的偏振作为总线量子比特。实现了原理验证实验。
英文摘要：
The Quantum Private Query is a quantum cryptographic protocol to recover information from a database, preserving both user and data privacy: the user can test whether someone has retained information on which query was asked, and the database provider can test the quantity of information released. Here we introduce a new variant Quantum Private Query algorithm which admits a simple linear optical implementation: it employs the photon's momentum (or time slot) as address qubits and its polarization as bus qubit. A proof-of-principle experimental realization is implemented.
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