Abstract
In this paper, we present a novel strategy to solve optimization problems within a hybrid quantum-classical scheme based on quantum annealing, with a particular focus on QUBO problems. The proposed algorithm implements an iterative structure where the representation of an objective function into the annealer architecture is learned and already visited solutions are penalized by a tabu-inspired search. The result is a heuristic search equipped with a learning mechanism to improve the encoding of the problem into the quantum architecture. We prove the convergence of the algorithm to a global optimum in the case of general QUBO problems. Our technique is an alternative to the direct reduction of a given optimization problem into the sparse annealer graph.
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Namely, the elements \(\{a_{ij}\}\) of A satisfy: \(a_{ij}\ge 0\) \(\forall i,j\) and \(\sum _{j} a_{ij}=1\) \(\forall i\).
G is strongly connected if for any pair of vertices \(x_i\) and \(x_j\) there is a direct path connecting them.
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Acknowledgements
The authors are grateful to the anonymous referee for substantial suggestions and useful comments and to Roberto Sebastiani and Margherita Zorzi for providing feedback on a preliminary version of the paper. This work is supported by Fondazione Caritro.
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Pastorello, D., Blanzieri, E. Quantum annealing learning search for solving QUBO problems. Quantum Inf Process 18, 303 (2019). https://doi.org/10.1007/s11128-019-2418-z
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DOI: https://doi.org/10.1007/s11128-019-2418-z