Abstract
We continue the systematic investigation of probabilistic and quantum finite automata (PFAs and QFAs) on promise problems by focusing on unary languages. We show that bounded-error unary QFAs are more powerful than bounded-error unary PFAs, and, contrary to the binary language case, the computational power of Las-Vegas QFAs and bounded-error PFAs is equivalent to the computational power of deterministic finite automata (DFAs). Then, we present a new family of unary promise problems defined with two parameters such that when fixing one parameter QFAs can be exponentially more succinct than PFAs and when fixing the other parameter PFAs can be exponentially more succinct than DFAs.
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Acknowledgements
Yakaryılmaz was partially supported by ERC Advanced Grant MQC and CAPES with grant 88881.030338/2013-01. We thank Viliam Geffert for his corrections on the text and the anonymous reviewers for their very helpful comments.
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A preliminary version appeared as “Aida Gainutdinova and Abuzer Yakaryılmaz. Unary probabilistic and quantum automata on promise problems. In Developments in Language Theory, volume 9168 of LNCS, pages 252–263. Springer, 2015.” [17].
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Gainutdinova, A., Yakaryılmaz, A. Unary probabilistic and quantum automata on promise problems. Quantum Inf Process 17, 28 (2018). https://doi.org/10.1007/s11128-017-1799-0
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DOI: https://doi.org/10.1007/s11128-017-1799-0