This question is somewhat related to this question. What is currently the best method for quantum process tomography? By best I mean, the one that can achieve the best accuracy of estimation per qubit used.
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2$\begingroup$ a relevant discussion is found in (Mohseni et al. 2008, quant-ph/0702131) $\endgroup$– glS ♦Apr 27, 2021 at 9:51