%0 Journal Article
%T Statistical distinguishability between unitary operations
%A A. Acin
%J Physics
%D 2001
%I arXiv
%R 10.1103/PhysRevLett.87.177901
%X The problem of distinguishing two unitary transformations, or quantum gates, is analyzed and a function reflecting their statistical distinguishability is found. Given two unitary operations, $U_1$ and $U_2$, it is proved that there always exists a finite number $N$ such that $U_1^{\otimes N}$ and $U_2^{\otimes N}$ are perfectly distinguishable, although they were not in the single-copy case. This result can be extended to any finite set of unitary transformations. Finally, a fidelity for one-qubit gates, which satisfies many useful properties from the point of view of quantum information theory, is presented.
%U http://arxiv.org/abs/quant-ph/0102064v2