Research On Quantum Ability And Quantum Cost In Blind Quantum Computation

Quantum computation is a novel computational model rooted in the principles of quantum mechanics,aiming to enhance computer performance.In comparison to classical computers,it exhibits exponential acceleration in computation speed.Despite the quantum computer has lots of developments in recent years,the challenges associated with maintaining and controlling qubit states may lead to future implementation through a method known as”delegated computation”.As the quantum cloud platform progresses,users are increasingly concerned about the security of their data.In light of this,blind quantum computation is created to keep the user’s(client’s)computation input,algorithm and output secret from the quantum computer(server).Blind quantum computation is a new computational model dividing a complete quantum computation into two parts,one of which is implemented by the client and the rest is performed by the server.However,the present blind quantum computation protocols require that the client possesses some quantum capabilities.Considering the extensive applications of blind quantum computation in the future,it is of great significance to explore new encryption pattern and scheme that require less quantum capability and cost of the client.The main research contents and innovations of this thesis can be seen as follows.1.A brickwork state with fewer qubits is established,by utilizing the quantum capability of the server,and combining two computational model,i.e.CBQC and MBQC.Then,the corresponding blind quantum computation protocol can be established based on this new brickwork state.This protocol not only reduces the number of interactions implemented by the server,but also satisfies the blindness of the algorithm simultaneously.2.A security loophole of universal half blind quantum computation protocol in the process of implementation of non-Clifford gate is proposed,and the method of operator teleportation is introduced into it to overcome the loophole.At the same time,two half blind quantum computation protocol are proposed under the preparation and measurement capability for the client respectively.It expands the application range of half blind quantum computation.3.A new encryption pattern which can encrypt algorithm according to the circuit diagram directly is constructed,based on the idea that the honest photons can be protected by the decoy photons in BB84 protocol.This pattern,different with classical pattern(brickwork state),avoids a large consumptions of the particles in the MBQC computational model.As a result,the corresponding blind quantum computation established from this pattern can simultaneously reduce the quantum cost and capability of clients.