量子广播信道上的识别

Universal superposition codes: capacity regions of compound quantum broadcast channel with confidential messages

We derive universal codes for transmission of broadcast and confidential messages over classical-quantum-quantum and fully quantum channels. These codes are robust to channel uncertainties considered in the compound model. To construct these codes we generalize random codes for transmission of public messages, to derive a universal superposition coding for the compound quantum broadcast channel. As an application, we give a multi-letter characterization of regions corresponding to the capacity of the compound quantum broadcast channel for transmitting broadcast and confidential messages simult…

Hadamard quantum broadcast channels

We consider three different communication tasks for quantum broadcast channels, and we determine the capacity region of a Hadamard broadcast channel for these various tasks. We define a Hadamard broadcast channel to be such that the channel from the sender to one of the receivers is entanglement-breaking and the channel from the sender to the other receiver is complementary to this one. As such, this channel is a quantum generalization of a degraded broadcast channel, which is well known in classical information theory. The first communication task we consider is classical communication to bot…

一种量子广播信道的父协议

A father protocol for quantum broadcast channels

提出了一种基于全量子Slepian-Wolf协议的量子广播信道协议。该协议产生一个可实现的速率区域的纠缠辅助传输的量子信息通过量子广播信道，可以被认为是量子模拟的经典广播信道的马顿区域。该协议可以适应于产生可实现的速率区域的无辅助量子通信和纠缠辅助的经典通信的情况下，无辅助传输，我们得到的区域没有独立的约束的总和速率，只有对个人的传输速率。所有三个速率区域的正则化版本可证明是最优的。

Key Assistance, Key Agreement, and Layered Secrecy for Bosonic Broadcast Channels

Secret-sharing building blocks based on quantum broadcast communication are studied. The confidential capacity region of the pure-loss bosonic broadcast channel is determined, both with and without key assistance, and an achievable region is established for the lossy bosonic broadcast channel. If the main receiver has a transmissivity of η<1/2, then confidentiality solely relies on the key-assisted encryption of the one-time pad. We also address conference key agreement for the distillation of two keys, a public key and a secret key. A regularized formula is derived for the key-agreement capac…

一种改进的经典-量子广播信道速率域

An improved rate region for the classical-quantum broadcast channel

我们提出了一个新的可达速率区域的两用户二进制输入的经典量子广播信道。其结果是经典的Marton-Gelfand-Pinsker区域的推广，并且可证明大于经典量子广播信道的最佳先前已知速率区域。可扩展性的证明是基于最近引入的极化编码方案及其对量子网络信息论的推广。

非信号协助广播信道的容量区域

The Capacity Region of the Broadcast Channel with Non-Signaling Assistance

该研究刻画了非信号协助下K用户离散无记忆广播信道的容量区域，发现其与佐藤区域重合，该区域基于消息子集和速率界定义，对应子集接收机的最坏情况完全协作。