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Q: Fachverband Quantenoptik und Photonik

Q 16: Ultracold Matter III – Fermions (joint session Q/A)

Q 16.5: Vortrag

Dienstag, 3. März 2026, 12:00–12:15, P 2

Local shielding of ground state wavefunctions during imaging of lithium-6 — •Daniel Dux, Tobias Hammel, Maximilian Kaiser, Finn Lubenau, Tim Schiffer, Matthias Weidemüller, and Selim Jochim — Physikalisches Institut, Heidelberg, Germany

We present a technique to locally shield ⁶Li atoms during spin-resolved fluorescence detection. By overlapping selected regions of the system with a laser beam tuned near the 2P ↔ 3S excited-state transition at 813 nm, we induce substantial light shifts of the D2 imaging transition due to the diverging polarizability close to the resonance. This shift strongly suppresses fluorescence from illuminated atoms while leaving the wavefunction unaffected, enabling selective shielding and thus local readout of the surrounding system.

We combine this shielding method with our novel free-space imaging scheme, which provides simultaneous, single-atom, spin-resolved detection. Together, these capabilities allow us to interrogate chosen subsets of the system while protecting others from measurement backaction. Integrating both modules into our modular experimental platform, the Heidelberg Quantum Architecture [1], we realize deterministically prepared few-body systems with programmable local readout.

[1]: T. Hammel, M. Kaiser, et al., Modular quantum gas platform, Phys. Rev. A 111, 033314

Keywords: Shielding; Imaging; Local Readout; Lithium; Quantum Simulation