Cycle discrete-time quantum walks on a noisy quantum computer

Wadhia, Vivek and Chancellor, Nicholas and Kendon, Viv (2024) Cycle discrete-time quantum walks on a noisy quantum computer. European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics, 78 (3). 29. ISSN 1434-6060 (

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The rapid development of quantum computing has led to increasing interest in quantum algorithms for a variety of different applications. Quantum walks have also experienced a surge in interest due to their potential use in quantum algorithms. Using the qiskit software package, we test how accurately the current generation of quantum computers provided by IBM can simulate a cycle discrete-time quantum walk. Implementing an 8-node, 8-step walk and a simpler 4-node, 4-step discrete-time quantum walk on an IBM quantum device known as ibmq_quito, the results for each step of the respective walks are presented. A custom noise model is developed in order to estimate that noise levels in the ibmq_santiago quantum device would need to be reduced by at least 94% in order to execute a 16-node, 16-step cycle discrete-time quantum walk to a reasonable level of fidelity. Graphic abstract: