Papers › Quantum Approximate Optimization Algorithm for Bayesian network structure learning

Quantum Approximate Optimization Algorithm for Bayesian network structure learning

4 Mar 2022arXiv:2203.02400archive 2025-07-28

Vicente P. Soloviev, Concha Bielza, Pedro Larrañaga

Bayesian network structure learning is an NP-hard problem that has been faced by a number of traditional approaches in recent decades. Currently, quantum technologies offer a wide range of advantages that can be exploited to solve optimization tasks that cannot be addressed in an efficient way when utilizing classic computing approaches. In this work, a specific type of variational quantum algorithm, the quantum approximate optimization algorithm, was used to solve the Bayesian network structure learning problem, by employing 3n(n-1)/2 qubits, where n is the number of nodes in the Bayesian network to be learned. Our results showed that the quantum approximate optimization algorithm approach offers competitive results with state-of-the-art methods and quantitative resilience to quantum noise. The approach was applied to a cancer benchmark problem, and the results justified the use of variational quantum algorithms for solving the Bayesian network structure learning problem.

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