Research And Application Of The Delegating Private Quantum Computation Protocols

The delegating private quantum computation is a circuit-based blind quantum computation model,which combines the quantum cryptography and quantum computing,it is similar to the cloud model.The delegating private quantum computation enables an almost classical client to perform the quantum computation with the help of the quantum center,and the privacy of client’s data or the algorithm is also guaranteed.In recently years,as an important branch of quantum computation,delegating private quantum computation has attracted much attentions.Some delegating private quantum computation protocols have been proposed with different discrete universal quantum gate set,we focus on the two delegating private quantum computation protocols with different quantum gate set.And we also proposed a quantum key agreement protocol and quantum private comparison protocol based the delegating private quantum computation model.There are two important jobs in this paper:(1)First,review the delegating private quantum computation(DQC)protocol proposed by Broadbent et.al.and the universal half-blind quantum computation,also called half-blind delegating private quantum computation(HDQC)protocol proposed by Tan et.al.,Consider the problems of encryption and decryption circuit of Toffoli gate in HDQC,we provide an improvement scheme.In DQC and HDQC,both of these two protocols just focus on the blindness of data(i.e.,the client’s input and output),but do not consider the blindness of computation(i.e.,the delegated quantum operation),so we propose a full-blind delegating quantum computation(FDQC)with the two different quantum gate set{H,P,CNOT,T} and{X,Z,H,P,R,CNOT}.And the universal gate,i.e.one of{H,P,CNOT,T} T is mixed in the sequence(H,P,T,CZ,CNOT),which makes the computation blind to the server.The analysis shows our protocol can correctly perform any delegating quantum computation,and also holds the full-blindness property.(2)Secondly,by studying the delegating private quantum computation,by employing the delegating computation model,we provide the almost classic client with the ability to perform the quantum key agreement protocol.In the proposed the quantum key agreement protocol,the participants only need the ability of accessing quantum channel and preparing single photons{|0>,|1>,|+>,|->},while the complicated quantum operations,such as the unitary operations and Bell measurement,will be delegated to the remote quantum center.Compared with previous quantum key agreement protocols,this client-server model is more feasible for the early era of quantum computer.In order to prevent the attacks from outside eavesdropper,the inner participants and quantum center,two single photon sequences are introduced to be randomly inserted into Bell states,the first is used to perform the quantum channel detection,and the second is applied to disorder the positions of message qubits.And we also propose a quantum private comparison protocol based on the delegating private quantum computation.