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arXiv · 2508.10968

High-contrast double Bragg interferometry via detuning control

Rui Li·Víctor José Martínez-Lahuerta·Naceur Gaaloul·Klemens Hammerer
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Abstract

We propose high-contrast Mach-Zehnder atom interferometers based on double Bragg diffraction (DBD) operating under external acceleration. To mitigate differential Doppler shifts and experimental imperfections, we introduce a tri-frequency laser scheme with dynamic detuning control. We evaluate four detuning-control strategies-conventional DBD, constant detuning, linear detuning sweep (DS-DBD), and a hybrid protocol combining detuning sweep with optimal control theory (OCT)-using exact numerical simulations and a five-level S-matrix model. The OCT strategy provides the highest robustness, maintaining contrast above 95\% under realistic conditions, while the DS-DBD strategy sustains contrast above 90\% for well-collimated Bose-Einstein condensates. These results offer practical pathways to high-contrast, large-momentum-transfer DBD-based interferometers for precision quantum sensing and fundamental physics tests.

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Rui Li, Víctor José Martínez-Lahuerta, Naceur Gaaloul, Klemens Hammerer. 2025-08-14. High-contrast double Bragg interferometry via detuning control. https://doi.org/10.1116/5.0302856

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