近日，陕西师范大学席政军团队研究了经典量子多址信道上的纠缠辅助私有通信。相关论文于2025年7月22日发表在《物理评论A》杂志上。

研究组考虑了经典量子多址信道上的两个发送者和一个接收者的纠缠辅助私有通信。首先确定了发送方和接收方共享无限纠缠资源的容量区域。在这种情况下，每个发送方对其所占的纠缠态进行编码测量，从而通过经典量子多址信道传输测量结果。同时，接收端对信道的输出状态和信道的纠缠态份额进行解码操作。研究组进一步推导出私有性能。

此外，研究组还考虑了只有两个发送者共享纠缠时的容量区域和私有容量。这相当于经典多址信道的量子扩展。值得注意的是，他们表明，当两个发送者与接收者共享纠缠时，容量区域严格大于只有两个发送者共享纠缠时的容量区域。

附：英文原文

Title: Entanglement-assisted private communication over a classical-quantum multiple-access channel

Author: Xiaomin Liu, Fangyuan Chen, Zhengjun Xi

Issue&Volume: 2025/07/22

Abstract: We consider entanglement-assisted private communication over a classical-quantum multiple-access channel with two senders and a single receiver. We initially determine the capacity region where senders and receiver share unlimited entanglement resources. In this setting, each sender performs an encoding measurement on their share of the entangled state to transmit a measurement outcome via the classical-quantum multiple-access channel. Meanwhile, the receiver applies a decoding operation to both the channel's output state and their share of the entangled state. We further derive the private capacity. Moreover, we consider the capacity region and private capacity when entanglement is shared between only the two senders. This corresponds to a quantum extension of the classical multiple-access channel with entanglement. Significantly, we show that the capacity region when both senders share entanglement with the receiver is strictly larger than when only the two senders share the entanglement.

DOI: 10.1103/2gbl-yb3v

Source: https://journals.aps.org/pra/abstract/10.1103/2gbl-yb3v