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QI: Fachverband Quanteninformation
QI 36: Poster – Quantum Information (joint session QI/Q)
QI 36.34: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Mitigation of longitudinal electric field components in a tweezer-sized standing-wave optical dipole trap — •Florian Fertig1,2, Pooja Malik1,2, Yiru Zhou1,2, Chengfeng Xu1,2, and Harald Weinfurter1,2,3 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3Max-Planck-Institut für Quantenoptik, Garching, Germany
Long coherence times are vital for large-scale quantum networks to distribute high-quality entanglement. Single atoms, trapped optically in an optical dipole trap (ODT), with an efficient light-matter interface for atom-photon entanglement have shown to be an excellent system for future quantum nodes. However, dephasing from fluctuations of external magnetic fields, but also effective magnetic fields arising from longitudinal electric field components in tightly focused tweezer beams (beam waist w0 ≈ 2 µ m), currently limit the coherence time.
Here, we present the successful implementation and characterization of a novel, tweezer-sized standing-wave ODT for single neutral atoms. This trap geometry effectively mitigates these effective magnetic fields. By overlapping two counterpropagating ODT beams, we create a standing wave, where the effective magnetic fields from each beam cancel each other out. Our measurements confirm the significant reduction of longitudinal field components, resulting in an increase in coherence time. Additionally, this trap architecture holds potential for multiplexing applications, offering a pathway to higher entanglement rates and enhanced quantum processing capabilities.
Keywords: Tweezer; Coherence Time; Optical Dipole Trap; Quantum Node; Quantum Memory