Fault-tolerant Blind Quantum Computation And Secure Multiparty Quantum Information Query

The calculation of quantum computer is far beyond that of classical computer.The sustainable development of quantum technology makes the appearance of quantum computer in the world possible,whose application will be a new research direction.Blind quantum computation(BQC)means that a client with limited quantum technology entrusts the computing task to a server with mature quantum computer,and thus the quantum server cannot get any information about the computing task.This paper studies the fault-tolerant blind quantum computing protocol,and further proposes a secure multi-party quantum private information query protocol based on the application of blind quantum computation.The fault-tolerant blind quantum computing protocol solves the problem of particle loss during the transmission of quantum resource states in the polarization channel.The quantum server uses logical Greenberger-Horne-Zeilinger(GHZ)state to resist quantum noise in polarization channel by using 7-qubit Calderbank-Shor-Steine(CSS)code.After the single qubit measurement based on Pauli-X and Pauli-Z,the client and the server obtain a qubit of the Bell states,respectively,which is the medium of quantum teleportation.After that,this protocol conveys resource state particles of quantum computation through quantum teleportation,and then performs BQC protocol in which only Alice makes measurements.This protocol proves the blindness and correctness of quantum computation.Recent studies about quantum private query only relate to quantum key distribution.Thus a secure multi-party quantum private information query protocol is proposed,which makes the multi-party private quantum information secure and reliable in quantum cloud computing environment.This protocol is a collaborative cooperation of quantum query database without disclosing the private input information of multiple users.The application of BQC to secure multi-party quantum private information query guarantees the privacy of multi-user quantum information and the reliability of having queried quantum information.