量子反馈通道
Quantum Feedback Channels
摘要：
在香农信息论中，无记忆通信信道的容量不能通过使用反馈来增加。在量子信息理论中，不可克隆定理意味着量子信息的无噪声复制和反馈是不可能实现的。本文将量子反馈定义为从接收者到发送者无限制地使用无噪声的量子信道。给出这样的量子反馈，它示出提供无记忆量子信道的纠缠辅助能力没有增加，在直接类比的经典情况。它也表明，在各种情况下的非辅助能力，反馈可以增加容量的无记忆量子信道。
英文摘要：
In Shannon information theory the capacity of a memoryless communication channel cannot be increased by the use of feedback. In quantum information theory the no-cloning theorem means that noiseless copying and feedback of quantum information cannot be achieved. In this paper, quantum feedback is defined as the unlimited use of a noiseless quantum channel from receiver to sender. Given such quantum feedback, it is shown to provide no increase in the entanglement--assisted capacities of a memoryless quantum channel, in direct analogy to the classical case. It is also shown that in various cases of non-assisted capacities, feedback may increase the capacity of memoryless quantum channels.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
