Perfect chiral quantum routing

• URL: http://arxiv.org/abs/2406.11834v1
• Date: Mon, 17 Jun 2024 17:59:55 GMT
• Title: Perfect chiral quantum routing
• Authors: Simone Cavazzoni, Giovanni Ragazzi, Paolo Bordone, Matteo G. A. Paris,
• Abstract summary: We consider information encoded in the position of a quantum walker on a graph. We design an optimal structure to achieve perfect quantum routing exploiting chirality and weighting of the edges.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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