Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 66: Poster: Entanglement

FM 66.5: Poster

Mittwoch, 25. September 2019, 16:30–18:30, Tents

Optimal Control of Schrödinger cat states of increasing size — •Matthias G. Krauß and Christiane P. Koch — Theoretische Physik III - Universität Kassel, D-34132 Kassel, Germany

"Schrödinger cat states" are non-classical superposition states that are useful in quantum information science, for example for computing or sensing. Optimal control theory provides a powerful tool for preparing these superposition states, for example in experiments with superconducting qubits [Ofek et al., Nature 536, 441445 (2016)]. The optimized control fields and the resulting dynamics are typically rather complex and an in depth analysis of dynamics is often omitted. Our goal is to analyze the underlying control mechanisms for Schrödinger cat state preparation and understand the physical strategies found by the algorithm. In particular, our objective is the generation of different cat states in a Bose-Hubbard model with increasing particle number. We use Krotovs method [Reich et al., J. Chem. Phys. 136, 104103 (2012)] to generate the different cat states, analyze the dynamics induced by the optimized fields and investigate whether the control mechanism varies as the particle number is increased.