Design On Protocols Of Quantum State Sharing And Remote Preparation Of Quantum State

Comparing with classical information technology, quantum information technology owns the advantages of higher security, carrying more information and calculating faster, so it has attracted extensive attention and research, at the same time, it generated many different research brunches, such as quantum state sharing, remote quantum state preparation, quantum computation, quantum encryption keys distribution and so on. This paper mainly involves two fields, namely quantum state sharing and remote preparation. Quantum state sharing and remote preparation play important roles in quantum communication. Quantum state sharing is similar to quantum teleportation, the senders in these two circumstances are unknown to the information of the target quantum state description. But quantum state remote preparation is different, the senders hold the specific information of the target quantum state, include coefficient information and phase information, so these two fields complement each other, and they are both built on quantum entanglement.About quantum state sharing, this paper researches high-dimensional quantum state sharing basically, we presented an innovative and efficient scheme for multi-participants sharing arbitrary n + 1-qudit states with generalized d-dimensional entangled Bell channels under the control of p agents. It contains the following steps, the sender Alice takes generalized GHZ measurements on her particles, subsequently, each controller Bobi performs generalized Hadamard measurement on his own particle, then the sender and controllers inform the receiver C harlie their measurement results, Charlie carry out corresponding unitary operations on his particle based on the sender and controllers’ measurement results. To remote preparation of quantum state, this paper proposed a complete scheme of joint remote preparation of 4-qubitχstate, the preparation starts from elementary EPR pairs, firstly, each controller performs CNOT operation on his particles and measures the target particle, secondly, each controller informs the controllers behind him, thirdly, each controller performs corresponding operatio n on his particle depend on the measurement results in front of him to generate GHZ state, fourthly, all participants collaborate to produce arbitrary 3-qubit state rely on the GHZ state they have generated, finally, the receiver introduces local operations to make 4-qubitχstate.The specific protocols introduced in this paper exhibit basic thought of quantum state sharing and remote preparation, in addition, we put forward some new methods to improve the efficiency of quantum resource exploitation and the flexibility of the protocols.