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A decision procedure for unitary linear quantum cellular automata

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2 Author(s)
Durr, C. ; Lab. de Recherche en Inf., Univ. de Paris-Sud, Orsay, France ; Santha, M.

Linear quantum cellular automata were introduced recently as one of the models of quantum computing. A basic postulate of quantum mechanics imposes a strong constraint on any quantum machine: it has to be unitary, that is its time evolution operator has to be a unitary transformation. In this paper we give an efficient algorithm to decide if a linear quantum cellular automaton is unitary. The complexity of the algorithm is O(n(4r-3)/(r+1))=O(n4) if the automaton has a continuous neighborhood of size r

Published in:

Foundations of Computer Science, 1996. Proceedings., 37th Annual Symposium on

Date of Conference:

14-16 Oct 1996

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