### Abstract

We prove quantum ergodicity for a family of graphs that are obtained from ergodic one-dimensional maps of an interval using a procedure introduced by Pakónski et al (J. Phys. A, 34, 9303-9317 (2001)). As observables we take the L ^{2} functions on the interval. The proof is based on the periodic orbit expansion of a majorant of the quantum variance. Specifically, given a one-dimensional, Lebesgue-measure-preserving map of an interval, we consider an increasingly refined sequence of partitions of the interval. To this sequence we associate a sequence of graphs, whose directed edges correspond to elements of the partitions and on which the classical dynamics approximates the Perron-Frobenius operator corresponding to the map. We show that, except possibly for subsequences of density 0, the eigenstates of the quantum graphs equidistribute in the limit of large graphs. For a smaller class of observables we also show that the Egorov property, a correspondence between classical and quantum evolution in the semiclassical limit, holds for the quantum graphs in question.

Original language | English |
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Pages (from-to) | 137-159 |

Number of pages | 23 |

Journal | Communications in Mathematical Physics |

Volume | 273 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1 Jul 2007 |

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## Cite this

*Communications in Mathematical Physics*,

*273*(1), 137-159. https://doi.org/10.1007/s00220-007-0244-0