Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Quantenkontrolle 1

MO 5.8: Talk

Monday, March 2, 2009, 15:45–16:00, VMP 6 HS-G

Femtosecond quantum control calculations in the frequency domain for vibrational processes — •Caroline Gollub and Regina de Vivie-Riedle — LMU, Department Chemie und Biochemie, Butenandtstr. 11, 81377 München

In recent years, coherent control of molecular vibrational excitation with shaped mid-IR laser fields has been achieved. Inspired by the experiments, the question is investigated whether and how the results of optimal control experiments based on genetic algorithms (GAs) can be traced in the solution subspace of optimal control theory. Calculations on vibrational unitary transformations are performed with single- [1] and multi-objective [2] GAs in close analogy to the experiment. The minimum requirements on the pulse properties can be extracted from the resulting Pareto fronts. Additionally, a flexible, alternative optimization approach is proposed based on a modified ant colony optimization algorithm. The method allows to decrease the shaped pulse complexity and duration, without loss of efficiency. Short pulse durations are essential in the context of quantum information processing for fast quantum gates which are most robust in the presence of dissipation. The experimental implementation prospects of IR quantum gates in W(CO)₆ are discussed in condensed phase.

[1] C. Gollub and R. de Vivie Riedle, Phys. Rev. A, 78 (2008), 033424.

[2] C. Gollub and R. de Vivie Riedle, New J. Phys., (2008) accepted.