Intra-QLAN Connectivity via Graph States: Beyond the Physical Topology

IF 6.7 2区 计算机科学 Q1 ENGINEERING, MULTIDISCIPLINARY
Francesco Mazza;Marcello Caleffi;Angela Sara Cacciapuoti
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Abstract

In the near to mid future, Quantum Local Area Networks (QLANs) – the fundamental building block of the Quantum Internet – will unlike exhibit physical topologies characterized by densely physical connections among the nodes. On the contrary, it is pragmatic to consider QLANs based on simpler, scarcely-connected physical topologies, such as star topologies. This constraint, if not properly tackled, will significantly impact the QLAN performance in terms of communication delay and/or overhead. Thankfully, it is possible to create on-demand links between QLAN nodes, without physically deploying them, by properly manipulating a shared multipartite entangled state, namely, a graph state. Thus, it is possible to build an overlay topology, referred to as artificial topology, upon the physical one, by only performing Local Operations and Classical Communication (LOCC). In this paper, we address the fundamental issue of engineering the artificial topology of a QLAN to bypass the limitations induced by the physical topology. The designed framework relays only on local operations, without exchanging signaling among the client nodes of the QLAN, which, in turn, would introduce further delays in a scenario very sensitive to the decoherence. Finally, by exploiting the artificial topology, it is proved that the troubleshooting is simplified, by overcoming the single point of failure, typical of classical LAN star topologies.
在中短期内,量子局域网(QLAN)--量子互联网的基本构件--将不同于以节点间密集物理连接为特征的物理拓扑结构。相反,考虑基于更简单、连接稀少的物理拓扑结构(如星形拓扑结构)的 QLAN 是实用的。如果处理不当,这一限制将在通信延迟和/或开销方面严重影响 QLAN 性能。值得庆幸的是,通过适当操纵共享的多方纠缠状态(即图状态),可以在 QLAN 节点之间创建按需链接,而无需进行物理部署。因此,只需执行本地操作和经典通信(LOCC),就有可能在物理拓扑基础上建立一个覆盖拓扑,即人工拓扑。在本文中,我们要解决的基本问题是如何设计 QLAN 的人工拓扑,以绕过物理拓扑带来的限制。所设计的框架只进行本地操作,而不在 QLAN 客户端节点之间交换信令,这反过来又会在对退相干非常敏感的场景中引入更多延迟。最后,通过利用人工拓扑结构,证明克服了传统局域网星形拓扑结构中典型的单点故障,从而简化了故障排除工作。
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来源期刊
IEEE Transactions on Network Science and Engineering
IEEE Transactions on Network Science and Engineering Engineering-Control and Systems Engineering
CiteScore
12.60
自引率
9.10%
发文量
393
期刊介绍: The proposed journal, called the IEEE Transactions on Network Science and Engineering (TNSE), is committed to timely publishing of peer-reviewed technical articles that deal with the theory and applications of network science and the interconnections among the elements in a system that form a network. In particular, the IEEE Transactions on Network Science and Engineering publishes articles on understanding, prediction, and control of structures and behaviors of networks at the fundamental level. The types of networks covered include physical or engineered networks, information networks, biological networks, semantic networks, economic networks, social networks, and ecological networks. Aimed at discovering common principles that govern network structures, network functionalities and behaviors of networks, the journal seeks articles on understanding, prediction, and control of structures and behaviors of networks. Another trans-disciplinary focus of the IEEE Transactions on Network Science and Engineering is the interactions between and co-evolution of different genres of networks.
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