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It is shown that a good estimate of the fidelity of an experimentallyrealized quantum process can be obtained by measuring the outputs for only twocomplementary sets of input states. The number of measurements required to testa quantum network operation is therefore only twice as high as the number ofmeasurements required to test a corresponding classical system.Comment: 5 pages, no figures, comments on quantum communication added, final  version for publication in Phys. Rev. Letter

Complementary Classical Fidelities as an Efficient Criterion for the Evaluation of Experimentally Realized Quantum Operations