Quantum Computing: 1-Way Quantum Automata

  • Alberto Bertoni
  • Carlo Mereghetti
  • Beatrice Palano
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2710)


In this paper we analyze several models of 1-way quantum finite automata, in the light of formal power series theory. In this general context, we recall two well known constructions, by proving:
  1. 1.

    Languages generated with isolated cut-point by a class of bounded rational formal series are regular.

  2. 2.

    If a class of formal series is closed under f-complement, Hadamard product and convex linear combination, then the class of languages generated with isolated cut-point is closed under boolean operations.


We introduce a general model of 1-way quantum automata and we compare their behaviors with those of measure-once, measure-many and reversible 1-way quantum automata.


formal power series quantum finite automata 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Alberto Bertoni
    • 1
  • Carlo Mereghetti
    • 1
  • Beatrice Palano
    • 1
  1. 1.Dipartimento di Scienze dell’InformazioneUniversità degli Studi di MilanoMilanoItaly

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