Quantum 2025 – wissenschaftliches Programm
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THU: Thursday Contributed Sessions
THU 11: Quantum Technology and Industry
THU 11.3: Vortrag
Donnerstag, 11. September 2025, 14:45–15:00, ZHG104
Ultra Broadband Lens for Quantum Computing Applications — •Thomas Fricke-Begemann1, Gregor Matz1, Christoph Charton1, Thomas Thoeniss1, Astrid Bingel2, and Friedrich Rickelt2 — 1Excelitas Technologies, Göttingen, Germany — 2Fraunhofer IOF, Jena, Germany
Quantum computing platforms using trapped ions or neutral atoms require optical control of an array of single qubits for a wide range of functionality including e.g. MOTs, optical tweezers, laser cooling, single and two qubit gates and detection. Ideally, the optical access involving multiple laser beam arrays over a large spectral bandwidth can be provided via a single optical system.
Here, we report on the development of an objective lens that allows the control of Rydberg atom qubits over a wavelength range from approximately 310 to 820 nm, thus enabling the use of a multitude of atomic transitions. It provides an ultra-long working distance and is designed to operate through the window of a UHV glass cell. The high NA allows addressing single qubits within a large field. To ensure high transparency over the large spectral bandwidth and to meet polarization preserving requirements, special AR-coatings including nanostructured layers with very low effective refractive index are used inside the lens.
Keywords: Quantum computing; Rydberg atom qubits; Optical control; High NA; Nanostructured coatings