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MON: Monday Contributed Sessions

MON 20: Quantum Sensing and Decoherence: Contributed Session to Symposium II

MON 20.2: Talk

Monday, September 8, 2025, 16:45–17:00, ZHG009

Top-Hat Laser Beams for Accurate Quantum Gravity Sensing — •Niranjan Myneni¹, Joël Gomes Baptista¹, Sébastien Merlet¹, Leonid Sidorenkov¹, Camille Janvier², and Franck Pereira Dos Santos¹ — ¹LTE, Observatoire de Paris, Université PSL, Sorbonne Université, Université Lille, LNE, CNRS, Paris, France. — ²Exail, Quantum Sensors, Gradignan, France.

Within the FIQUgS (Field Quantum Gravity Sensors) project, we investigate the use of top-hat laser beams to improve the performance of atom interferometers in precision inertial sensing. This work extends earlier efforts [1] demonstrating the benefits of flat-top beams towards evaluating systematic errors. We analyze both measured (Shack-Hartmann wavefront sensing) and simulated intensity and wavefront profiles, studying their propagation stability and aberration sensitivity over relevant distances. Atomic simulations quantify their impact on interferometric contrast, phase stability and accuracy. We explore beam-reducing/expanding optics to adapt top-hat beams to the required beam size for various sensor architectures. Simulations are conducted for both the FIQUgS instruments and other experimental platforms [2] available at LTE (formerly SYRTE). The results of these simulations will be benchmarked against the performance of the FIQUgS instruments evaluated during an extensive metrological campaign. This work contributes to advance compact, high-precision quantum gravimeters [3] and enhance their robustness for field deployment.

1. Appl. Phys. Lett., 113 (16), 161108(2018). 2. Phys. Rev. A 106, 013303 (2022). 3. Phys. Rev. A 105, 022801 (2022).

Keywords: Atomic Accelerometry, gravimetry, Top-hat beams