Routing Qubits on Noisy Networks

TL;DR

This paper studies the robustness of quantum routing protocols in noisy network architectures, focusing on how well they transfer quantum information under various noise conditions.

Contribution

It introduces a model of quantum routing using quantum walks and evaluates the protocols' resilience to static and dynamical noise.

Findings

Routing protocols show varying robustness depending on noise type.

Quantum walk encoding enables analysis of routing performance.

Certain protocols maintain high fidelity under specific noise regimes.

Abstract

Robust quantum routing is essential for scalable quantum technologies. This paper investigates the resilience of routing protocols in network architectures designed for perfect, high-fidelity transfer of both classical and quantum information under ideal conditions. We encode information in the position of a quantum walker on a graph, modelling the routing of a generic qubit state from a single input to multiple (orthogonal) outputs. We analyse and assess routing performance in various regimes, evaluating their robustness against static and dynamical noise.