Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 39: Precision Measurements II (joint session Q/A)
A 39.3: Talk
Friday, March 15, 2024, 11:30–11:45, HS 1221
Analytical theory of double Bragg diffraction in light-pulse atom interferometers — •Rui Li1, Klemens Hammerer2, and Naceur Gaaloul1 — 1Leibniz University Hanover, Institute for quantum optics, Hannover, Germany — 2Leibniz University Hanover, Institute for theoretical physics, Hannover, Germany
In this talk, we provide some new physical insights into a recently used tool in atom interferometry, namely the double Bragg diffraction (DBD). We derive an effective two-level-system (TLS) Hamiltonian via Magnus expansion for describing the so-called *quasi-Bragg regime* where most light-pulse atom interferometers are operating. With this effective TLS Hamiltonian, we systematically study the effects of polarization error and AC-Stark shift due to second-order process on the efficiency of double-Bragg beam-splitters. Furthermore, we show that effects of Doppler broadening can be easily included by extending our TLS description to a three-level-system description. With the help of our effective theory, we design an optimal beam-splitter via a time-dependent detuning and show its robustness against polarization error and asymmetric beam-splitting due to Doppler effect.
This work is supported through the Deutsche Forschungsgemeinschaft (DFG) under EXC 2123 QuantumFrontiers, Project-ID 390837967 and under the CRC1227 within Project No. A05 as well as by DLR funds from the BMWi (50WM2250A-QUANTUS+)
Keywords: Atom interferometry; Double Bragg diffraction; Doppler broadening; Polarization error effect; Magnus expansion