Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 2: Quantum Machine Learning I
QI 2.7: Vortrag
Montag, 10. März 2025, 12:30–12:45, HS VIII
Optimal recoil-free state preparation in an optical atom tweezer — •Lia Kley1,2, Nicolas Heimann1,2,3, Aslam Parvej1,2, Lukas Broers1,2, 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
Quantum computing in atom tweezers requires high-fidelity implementations of quantum operations. Here, 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. We generate these for a large parameter space, from small to large values of the Rabi frequency, and a range of pulse lengths. We identify three main regimes for the optimal protocols, and discuss their properties. In all of these regimes, we demonstrate infidelity well below the current technological standard, thus mitigating a universal challenge in atom tweezers and other quantum technology platforms.
Keywords: Neutral atoms; State preparation; Quantum computing; Rydberg atoms; Quantum optimal control and machine learning