Quantum 2025 – wissenschaftliches Programm
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MON: Monday Contributed Sessions
MON 20: Quantum Sensing and Decoherence: Contributed Session to Symposium II
MON 20.2: Vortrag
Montag, 8. September 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