Controlled D-dimensional Quantum Nonlocal Gate And Its Application

Quantum computing is a new computing mode that uses the laws of quantum mechanics to control the quantum information unit.Due to the existence of quantum superposition and quantum coherence,quantum algorithms show faster processing speed than classical computers,and the development of quantum computing network also enables ordinary users to connect to the distributed quantum computer group to verify quantum algorithms by using classical communication or quantum communication technology.In wide area quantum computing network,ordinary users need to distribute their limited secret resources to the quantum servers in the network,and publish the tasks of each quantum server.The whole quantum computing is thus completely transparent to the quantum processors in the network.There is no doubt that users' information is under huge security risks.In this paper,a new secure quantum computing network model is proposed,which allows users to access high-dimensional quantum network,control the operation process of nonlocal phase gate between quantum servers,and monitor whether the quantum servers have eavesdropping behavior,so as to realize the secure nonlocal quantum computing process.The main achievements are as follows.1.Using the three body entangled quantum channel,a user controlled non local controlled gate operation scheme between two quantum servers is proposed.Aiming at the behavior of dishonest quantum servers jointly eavesdropping on user algorithm,a user security detection strategy is proposed to ensure that the quantum server can not steal user algorithm information,The security detection threshold of three different quantum channels is given,.2.The concept of quantum control power in computational network is proposed,and the user's control powers of nonlocal gate operation in three different quantum channels are quantified and calculated,and compared with those in controlled quantum teleportation.It is found that under the same channel resource,the user has more control authority over the nonlocal gate.It is concluded that for ordinary users without local quantum computing devices,our scheme shows better control power than uploading secure quantum states.