De Finetti representation theorem for quantum-process tomography (6 pages)

The de Finetti representation theorem to express the experimenter's prior information in quantum-process tomography was discussed. The information was expressed as a sequence of quantum operations. The exchangeability for sequence of quantum operations was defined in the analology to de Finetti's concept. The theorem was found to be useful in the simple characterization of admissible priors for quantum process tomography and solving the problem of unknown quantum operation to a Bayesian's satisfaction.

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