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Investigating the Chinese postman problem on a quantum annealer

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Abstract

The recent availability of quantum annealers has fueled a new area of information technology where such devices are applied to address practically motivated and computationally difficult problems with hardware that exploits quantum mechanical phenomena. D-Wave annealers are promising platforms to solve these problems in the form of quadratic unconstrained binary optimization. Here we provide a formulation of the Chinese postman problem that can be used as a tool for probing the local connectivity of graphs and networks. We treat the problem classically with a tabu algorithm and simulated annealing, and using a D-Wave device. The efficiency of quantum annealing with respect to the simulated annealing has been demonstrated using the optimal time to solution metric. We systematically analyze computational parameters associated with the specific hardware. Our results clarify how the interplay between the embedding due to limited connectivity of the Chimera graph, the definition of logical qubits, and the role of spin-reversal controls the probability of reaching the expected solution.

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Acknowledgments

This work is supported by the Department of Energy award DE-SC0019432 and by the James H. Zumberge Faculty Research and Innovation Fund at the University of Southern California. The research is based upon work (partially) supported by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA) and the Defense Advanced Research Projects Agency (DARPA), via the U.S. Army Research Office contract W911NF-17-C-0050. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the ODNI, IARPA, DARPA, or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright annotation thereon.

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Correspondence to Marco Fornari.

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Ilaria Siloi and Virginia Carnevali contributed equally to this work.

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Siloi, I., Carnevali, V., Pokharel, B. et al. Investigating the Chinese postman problem on a quantum annealer. Quantum Mach. Intell. 3, 3 (2021). https://doi.org/10.1007/s42484-020-00031-9

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  • DOI: https://doi.org/10.1007/s42484-020-00031-9

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