Abstract
In this paper we show that the hidden subgroup problem in nil-2 groups, that is in groups of nilpotency class at most 2, can be solved efficiently by a quantum procedure. The algorithm is an extension of our earlier method for extraspecial groups in Ivanyos et al. (Proceedings of the 24th Symposium on Theoretical Aspects of Computer Science (STACS), vol. 4393, pp. 586–597, 2007), but it has several additional features. It contains a powerful classical reduction for the hidden subgroup problem in nilpotent groups of constant nilpotency class to the specific case where the group is a p-group of exponent p and the subgroup is either trivial or cyclic. This reduction might also be useful for dealing with groups of higher nilpotency class. The quantum part of the algorithm uses well chosen group actions based on some automorphisms of nil-2 groups. The right choice of the actions requires the solution of a system of quadratic and linear equations. The existence of a solution is guaranteed by the Chevalley-Warning theorem, and we prove that it can also be found efficiently.
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Research supported by the European Commission Project Qubit Applications (QAP) 015848 and the FP7-ICT-2009-C Project Quantum Computer Science (QCS) 255961, the OTKA grants NK72845 and T77476, the French ANR QRAC project under contract ANR-08-EMER-012 and by the CNRS-MTA joint project 21434. Part of this work was conducted during the first author’s research visit at the Centre for Quantum Technologies, National University of Singapore. Research at the Centre for Quantum Technologies is funded by the Singapore Ministry of Education and the National Research Foundation. A preliminary version of this paper was presented at the 8th Latin American Theoretical Informatics Symposium (LATIN’08), Lecture Notes in Computer Science (LNCS), vol. 4957, pages 759–771, 2008.
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Ivanyos, G., Sanselme, L. & Santha, M. An Efficient Quantum Algorithm for the Hidden Subgroup Problem in Nil-2 Groups. Algorithmica 62, 480–498 (2012). https://doi.org/10.1007/s00453-010-9467-0
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DOI: https://doi.org/10.1007/s00453-010-9467-0