We consider related problems in quantum communications: distribution of information and a secret key between a sender and several receivers. We study the gain of participants of communication protocols both from the use of collective measurements and from collective actions at the transmitter's side related to the employment of entangled states and various actions on them.

中文翻译：

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集体准备和状态测量在某些量子通信协议中的作用

我们考虑量子通信中的相关问题：在发送方和多个接收方之间分配信息和密钥。我们从集体测量的使用以及发射机端与纠缠态的使用以及对它们的各种动作有关的集体动作中研究通信协议参与者的收益。