Quantum control theory for coupled 2-electron dynamics in quantum dots

Details Quantum control theory for coupled 2-electron dynamics in quantum dots Quantum control theory for coupled 2-electron dynamics in quantum dots

2008-10-21

arxiv.org/abs/0810.3785v1

Physics

Quantum Physics

24 pages, 9 figures

Scientific paper

We investigate optimal control strategies for state to state transitions in a model of a quantum dot molecule containing two active strongly interacting electrons. The Schrodinger equation is solved nonperturbatively in conjunction with several quantum control strategies. This results in optimized electric pulses in the THz regime which can populate combinations of states with very short transition times. The speedup compared to intuitively constructed pulses is an order of magnitude. We furthermore make use of optimized pulse control in the simulation of an experimental preparation of the molecular quantum dot system. It is shown that exclusive population of certain excited states leads to a complete suppression of spin dephasing, as was indicated in Nepstad et al. [Phys. Rev. B 77, 125315 (2008)].

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