Title: State Transfer in Noisy Modular Quantum Networks Show Chinese title

Title: 噪声模块化量子网络中的状态转移

Abstract: Quantum state transfer is the act of transferring quantum information from one system in a quantum network to another without physically transporting carriers of quantum information, but instead engineering a Hamiltonian such that the state of the sender is transferred to the receiver through the dynamics of the whole network. A generalization of quantum state transfer called quantum routing concerns simultaneous transfers between multiple pairs in a quantum network, imposing limitations on its structure. In this article we consider transfer of Gaussian states over noisy quantum networks with modular structure, which have been identified as a suitable platform for quantum state routing. We compare two noise models, affecting either the network topology or the network constituents, studying their effects on both the transfer fidelities and the network properties. We find that the two models affect different features of the network allowing for the identification and quantification of the noise. We then use these features as a guide towards different strategies for the compensation of the noise, and examine how the compensation strategies perform. Our results show that in general, modular networks are more robust to noise than monolithic ones. Show Chinese abstract

Abstract: 量子态传输是从量子网络中的一个系统向另一个系统传递量子信息的行为，而无需物理地运输量子信息的载体，而是通过设计一个哈密顿量，使得发送者的状态通过整个网络的动力学传递给接收者。 一种称为量子路由的量子态传输的推广形式涉及量子网络中多对之间的同时传输，这对其结构施加了限制。 在本文中，我们考虑在具有模块化结构的噪声量子网络上传输高斯态，这些网络已被确定为量子态路由的合适平台。 我们比较了两种噪声模型，一种影响网络拓扑，另一种影响网络组成部分，研究它们对传输保真度和网络特性的影响。 我们发现这两种模型影响网络的不同特征，从而可以识别和量化噪声。 然后，我们利用这些特征作为补偿噪声的不同策略的指导，并检查这些补偿策略的效果。 我们的结果表明，一般来说，模块化网络比单块网络更能抵抗噪声。