Abstract
The assertion by Simmons and Park that the dynamical map associated with the Bloch equations of nuclear magnetic resonance is not completely positive is wrong.
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Raggio, G.A., Primas, H. Remarks on “On Completely Positive Maps in Generalized Quantum Dynamics”. Found Phys 12, 433–435 (1982). https://doi.org/10.1007/BF00726787
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DOI: https://doi.org/10.1007/BF00726787