Quantum process tomography is a procedure by which an unknown quantum operation can be fully experimentally characterized. We reinterpret Choi's proof of the fact that any completely positive linear map has a Kraus representation [Lin. Alg. and App., 10, 1975] as a method for quantum process tomography. Furthermore, the analysis for obtaining the Kraus operators are particularly simple in this method.
@article{arxiv.quant-ph/0201119,
title = {Choi's Proof and Quantum Process Tomography},
author = {D. W. Leung},
journal= {arXiv preprint arXiv:quant-ph/0201119},
year = {2015}
}