关键词: 远程态制备, 联合远程态制备, 分层量子通信, 多量子图态, 前馈测量策略

Abstract: A novel protocol for multiparty hierarchical remote state preparation (MHRSP) of arbitrary single-qubit state with multipartite entangled graph state as the channel is proposed. In the scheme, by using the feed-forward measurement strategy, a boss distributes a secret quantum state to two grades of agents asymmetrically, where the number of agents in both grades can be arbitrary in principle, and the agents who belong to different grades have different authorities for restoring the boss's secret. Further, this paper extends the above MHRSP protocol to obtain a scheme of multiparty hierarchical joint remote state preparation (MHJRSP). The presented two schemes involve no nonlocal operation. They are shown to be secure against eavesdropping, and expected to find useful applications in the real world.

Key words: remote state preparation, joint remote state preparation, hierarchical quantum communication, multi-qubit graph state, feed-forward measurement strategy