Abstract
We introduce several new definitions of universality for sets of quantum gates, and prove separation results for these definitions. In particular, we prove that realisability with ancillas is different from the classical notion of completeness. We give a polynomial time algorithm of independent interest which decides if a subgroup of a classical group (SO n , SU n , SL n ...) is Zariski dense, thus solving the decision problem for the completeness. We also present partial methods for the realisability with ancillas.
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Jeandel, E. (2004). Universality in Quantum Computation. In: Díaz, J., Karhumäki, J., Lepistö, A., Sannella, D. (eds) Automata, Languages and Programming. ICALP 2004. Lecture Notes in Computer Science, vol 3142. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-27836-8_67
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DOI: https://doi.org/10.1007/978-3-540-27836-8_67
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-22849-3
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