Quantum Private Information Retrieval Based on Polarization Rotation

Private information retrieval is the important issue of secure multi-party computation. Many assumptions of traditional Symmetric Private Information Retrieval (SPIR) are vulnerable in quantum mechanics and the present quantum SPIR protocols are complex to implement. A symmetric quantum SPIR protocol and experiment realization scheme are proposed. This scheme bases on polarized single photons to generate the key, so it has the advantage of simple operation and easy to hardware implement. The unconditional security of the protocol is guaranteed by Heisenberg uncertainty principle and quantum no-cloning theory. Dishonest user detection is involved in the protocol, the dishonest users could not get any information by malicious behavior under the dishonest cooperation model. The proposed scheme has better performance at security, robustness, anti-third party eavesdropping than many classical SPIR schemes.