Glaser SJ, Schulte-Herbruggen T, Sieveking M, Schedletzky O, Nielsen NC, Sorensen OW, Griesinger C
S. J. Glaser, O. Schedletzky, C. Griesinger, Institut fur Organische Chemie, J. W. Goethe-Universitat, Marie-Curie-Strasse 11, D-60439 Frankfurt, Germany. T. Schulte-Herbruggen, Laboratorium fur Physikalische Chemie, ETH Zentrum, CH-809.
Science. 1998 Apr 17;280(5362):421-4. doi: 10.1126/science.280.5362.421.
Experiments in coherent magnetic resonance, microwave, and optical spectroscopy control quantum-mechanical ensembles by guiding them from initial states toward target states by unitary transformation. Often, the coherences detected as signals are represented by a non-Hermitian operator. Hence, spectroscopic experiments, such as those used in nuclear magnetic resonance, correspond to unitary transformations between operators that in general are not Hermitian. A gradient-based systematic procedure for optimizing these transformations is described that finds the largest projection of a transformed initial operator onto the target operator and, thus, the maximum spectroscopic signal. This method can also be used in applied mathematics and control theory.
