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Fidelity of single qubit maps

Oi, D.K.L. and Bowdrey, M.D. and Short, A.J. and Jones, J.A. and Banaszek, K. (2002) Fidelity of single qubit maps. Physics Letters A, 294 (5-6). pp. 258-260. ISSN 0375-9601

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We give a simple way of characterising the average fidelity between a unitary and a general operation on a single qubit which only involves calculating the fidelities for a few pure input states.