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Quantum Advantage for the LOCAL Model in Distributed Computing

Authors François Le Gall, Harumichi Nishimura, Ansis Rosmanis

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Author Details

François Le Gall
  • Graduate School of Informatics, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Harumichi Nishimura
  • Graduate School of Informatics, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
Ansis Rosmanis
  • Centre for Quantum Technologies, National University of Singapore, Block S15, 3 Science Drive 2, 117543, Singapore


FLG was partially supported by the JSPS KAKENHI grants No. 15H01677, No. 16H01705 and No. 16H05853. HN was partially supported by the JSPS KAKENHI grants No. 26247016, No. 16H01705 and No. 16K00015. AR was partially supported by the Singapore Ministry of Education and the National Research Foundation under grant R-710-000-012-135. Part of this work was done while AR was visiting Kyoto University, and AR would like to thank FLG for hospitality.

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François Le Gall, Harumichi Nishimura, and Ansis Rosmanis. Quantum Advantage for the LOCAL Model in Distributed Computing. In 36th International Symposium on Theoretical Aspects of Computer Science (STACS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 126, pp. 49:1-49:14, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2019)


There are two central models considered in (fault-free synchronous) distributed computing: the CONGEST model, in which communication channels have limited bandwidth, and the LOCAL model, in which communication channels have unlimited bandwidth. Very recently, Le Gall and Magniez (PODC 2018) showed the superiority of quantum distributed computing over classical distributed computing in the CONGEST model. In this work we show the superiority of quantum distributed computing in the LOCAL model: we exhibit two computational tasks that can be solved in a constant number of rounds in the quantum setting but require Omega(n) rounds in the classical (randomized) setting, where n denotes the size of the network.

Subject Classification

ACM Subject Classification
  • Theory of computation → Quantum computation theory
  • Quantum computing
  • distributed computing
  • LOCAL model


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