Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 70: Quantum Optics and Control II
Q 70.5: Vortrag
Freitag, 6. März 2026, 12:15–12:30, P 3
Pulse Engineering via Projection of Response Functions for Optimal recoil-free state preparation in an optical atom tweezer — •Lia Kley1,2 and Ludwig Mathey1,2,3 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany — 2Institut für Quantenphysik, Universität Hamburg, 22761 Hamburg, Germany — 3The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
High-fidelity control of quantum systems requires methods that are both flexible and practical. We introduce a new method for optimal control that iteratively refines control parameters by evaluating the response of the fidelity to the applied control operators. It aims to implement target operations reliably with high fidelity, while extending established optimal-control techniques by providing access to the parameter update without explicit calculation of gradients, enhancing both practicality and applicability. To illustrate its potential, we demonstrate the optimal implementation of the transition |0⟩→ |1⟩ of two levels, serving as a qubit, of an atom in a tweezer potential, driven by a single-photon Rabi pulse. The Rabi pulse generates a photon recoil of the atom, due to the Lamb-Dicke coupling between the internal and motional degree of freedom, driving the system out of the logical subspace. This detrimental effect is strongly suppressed in the protocols that we propose. Using pulse engineering, we generate optimal protocols composed of a Rabi protocol and a force protocol, corresponding to dynamically displacing the tweezer.
Keywords: Quantum Optimal Control; Response theory; Quantum Gates