论文标题
通过量子因果结构进行古典交流
Classical communication through quantum causal structures
论文作者
论文摘要
量子力学允许运营处于不确定的因果秩序。最近，通过异国因果结构进行了有关增强交流策略的积极讨论。鉴于此，通过过程矩阵形式主义，我们为双方量子过程制定了不同的经典能力。我们发现，通过任意过程的单向通信协议不能超越可分离的过程，即，我们可以每量子器最多发送一个位。接下来，我们通过可分离的过程来研究双向交流。我们的结果表明，双向协议不能超过一种方式通信协议的极限。最后，我们通过确定的有序过程将此结果推广到多方广播通信协议。
Quantum mechanics allows operations to be in indefinite causal order. Recently there have been active discussions on enhanced communication strategies through exotic causal structures. In light of this, through the process matrix formalism, we formulate different classical capacities for a bi-partite quantum process. We find that a one-way communication protocol through an arbitrary process cannot outperform a causally separable process, i.e., we can send at most one bit per qubit. Next, we study bi-directional communication through a causally separable process. Our result shows, a bi-directional protocol cannot exceed the limit of one way communication protocol. Finally, we generalise this result to multi-party broadcast communication protocol through a definite ordered process.
