论文标题
高斯量子网络与不受信任的继电器的组合端到端安全性
Composable end-to-end security of Gaussian quantum networks with untrusted relays
论文作者
论文摘要
高斯网络是网络信息理论中的基本对象。在这里，许多发件人和接收器都通过有力动机的高斯频道连接，而辅助高斯组件（例如高斯继电器）则需要。虽然经典高斯网络的理论骨干已经建立了良好，但量子类似物尚未成熟。在这里，我们从理论上讲，在有限尺寸的制度中，我们在任意高斯量子网络（量子网络）（量子网络）（量子网络）的可组合安全性。我们提出了一种用于参数估计的一般方法，该方法仅基于远程最终用户共享的数据。以一系列相同的量子联系为例，我们进一步证明了我们的研究。此外，我们发现，量子放大器辅助链的关键速率理想地可以超过基本的无用限制，而实用的块尺寸。但是，实际上，这一目标是领导着新的网络/连锁设计的道路。
Gaussian networks are fundamental objects in network information theory. Here many senders and receivers are connected by physically motivated Gaussian channels while auxiliary Gaussian components, such as Gaussian relays, are entailed. Whilst the theoretical backbone of classical Gaussian networks is well established, the quantum analogue is yet immature. Here, we theoretically tackle composable security of arbitrary Gaussian quantum networks (quantum networks), with generally untrusted nodes, in the finite-size regime. We put forward a general methodology for parameter estimation, which is only based on the data shared by the remote end-users. Taking a chain of identical quantum links as an example, we further demonstrate our study. Additionally, we find that the key rate of a quantum amplifier-assisted chain can ideally beat the fundamental repeaterless limit with practical block sizes. However, this objective is practically questioned leading the way to new network/chain designs.
