Design On Several Protocols For Quantum State Remote Transmission And Operations Based On Quantum Network

In the 20 th century, with the development and combined of quantum mechanics and information science, quantum theory developed into a new subject by virtue of its unique characteristics in the field of information – quantum information science. Quantum communication as an important research branch of quantum information theory, it includes quantum states, quantum key distribution, quantum state preparation, quantum dense coding, and quantum state sharing. The remote preparation and operation of quantum state play an important role in the network system framework. Especially, the resources of quantum, the efficiency of the protocol and universality are used as the crucial indicators in terms of evaluation of the merits of the protocols.In this paper, we mainly discuss three protocols, including the remote preparation of arbitrary unknown multi-qudit state, faithful teleportation via multi-particle quantum states and implementation of multi-qudit parallel control operations on distant qudits in quantum network. Firstly, Due to the impact of the presence of decoherence, the quantum communication channel often degrades from maximally entangled channels to non-maximally entangled channels. Actually, the probabilities of quantum teleportation are not 100% via non-maximally entangled channel. Therefore, it is an important issue that how to use the non-maximally entangled channel to teleport the quantum state. In this paper, we propose a new idea that utilizes k generalized Bell pairs to construct faithful multi-level quantum channel cleverly. It makes quantum state can be transmitted definitely between sender and receiver. Secondly, according to quantum cloning theorem, the preparation of quantum state can be said to be quantum teleportation. Currently, these research schemes mainly from the following aspects to analysis: the characteristics of quantum channels, efficiency, the probability of success and resources, but there is not a scheme for universal quantum state preparation. Therefore, we present a scheme for the remote preparation of arbitrary unknown multi-qudit state, which utilizes Bell channels. It makes the scheme has broader applicability. Moreover, we also verify the feasibility base on the theory and analysis the use of quantum resources and prove the safety of scheme according to the safety testing. Lastly, this paper respectively discusses two remote quantum control schemes based on different quantum networks. It mainly proposes the idea of ―cat-like‖ state which via quantum door operations comes true. By transmitting ―cat-like‖ state to achieve control of the remote target, it breaks traditional mind and greatly improves work efficiency.