Abstract: Remote State Preparation (RSP) is a branch of quantum information processing. In order to prepare the same state to multiple recipients, a broadcast-based RSP protocol was proposed for one sender and two receivers, and then it was extend to N receivers. GHZ states were used as shared quantum resources. By constructing two special measurement bases, the sender realized two times of multi-particle projective measurement; then the receivers used unitary operation to recover the prepared state depending on the measurement results. Analysis shows that multiparty RSP protocol can be used to broadcast information in quantum network.

Key words: Remote State Preparation (RSP), multiparty receiver, project measurement, unitary operation, broadcast mechanism

摘要： 量子态远程制备(RSP)是量子信息过程的一个重要分支。为了解决一个发送者向多个接收者同时制备相同量子态的问题，提出了基于广播机制的1对2三方量子态远程制备协议，并将其拓展到1对N多方量子态远程制备中。该协议使用GHZ态作为量子信道，通过构造两组特殊测量基，发送方进行两次多粒子投影测量，接收方根据测量结果进行幺正操作，最终实现1个发送者向多个接收者同时制备相同的粒子态。经分析，协议的这种广播制备模式可以适用于任意多个接收者的情形。

关键词: 量子态远程制备, 多接收者, 投影测量, 幺正操作, 广播机制