Perfect chiral quantum routing

Routing classical and quantum information is a fundamental task for most quantum information technologies and processes. Here, we consider information encoded in the position of a quantum walker on a graph, and design an optimal structure to achieve perfect quantum routing exploiting chirality and w...

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Bibliographic Details
Main Authors Cavazzoni, Simone, Ragazzi, Giovanni, Bordone, Paolo, Paris, Matteo G. A
Format Journal Article
LanguageEnglish
Published 17.06.2024
Subjects
Physics - Quantum Physics
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Summary:Routing classical and quantum information is a fundamental task for most quantum information technologies and processes. Here, we consider information encoded in the position of a quantum walker on a graph, and design an optimal structure to achieve perfect quantum routing exploiting chirality and weighting of the edges. The topology, termed the {\em Lily Graph}, enables perfect (i.e., with fidelity one) and robust routing of classical (localized) or quantum (superposition) states of the walker to $n$ different, orthogonal, spatial regions of the graph, corresponding to the $n$ possible outputs of the device. The routing time is independent of the input signal and the number of outputs, making our scheme a robust and scalable solution for quantum networks.
DOI:10.48550/arxiv.2406.11834