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QI: Fachverband Quanteninformation
QI 37: Poster – Quantum Information Technologies (joint session Q/QI)
QI 37.27: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Fermionic State Preparation and Imaging in Tweezer Arrays — •Kirill Khoruzhii1,3, Naman Jain1, Marcus Culemann1, Jin Zhang1, Xinyi Huang1, Pragya Sharma1, Jun Ong1, and Philipp Preiss1,2 — 1Max Planck Institute of Quantum Optics, Garching — 2Ludwig-Maximilians-Universität, Munich — 3Munich Center for Quantum Science and Technology
We demonstrate a platform for deterministic preparation of ultracold fermionic lithium-6 atoms in a tweezer array, combined with rapid and high-fidelity free-space spin-resolved imaging. This system enables programmable initialization of atomic arrays, providing a foundation for hybrid tweezer/lattice experiments and quantum simulation. Atoms are loaded into a tweezer array generated by two orthogonally oriented acousto-optic deflectors (AODs). Using magnetic field gradients for controlled atom spilling, we prepare pairs of spin-up and spin-down atoms in the ground state of each tweezer with over 90% success rate. The entire experiment cycle is completed in under 2 seconds. Uniformity of the AOD-generated tweezer array is ensured through model-based optimization, achieving intensity homogeneity to within 1% for arrays up to 10x10 tweezers. This consistency is crucial for reliable state preparation. For imaging, counter-propagating resonant beams illuminate the atoms for 20 μs and enable free-space single atom detection with a fidelity exceeding 95%. Spin states are distinguished by polarization-dependent fluorescence, with photons spatially separated and directed to the camera. This platform will be used to realize a fermionic many-body interferometer.
Keywords: Quantum Simulation; Tweezer Arrays; Ultracold Fermions; Spin-Resolved Imaging