Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 3: Precision Measurements and Metrology I
Q 3.5: Talk
Monday, March 14, 2022, 15:00–15:15, Q-H11
Mitigation of spurious effects in double Bragg diffraction — •Jens Jenewein1, Sabrina Hartmann1, Albert Roura2, and Enno Giese1,3,4 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm — 2Institut für Quantentechnologien, DLR — 3Institut für Angewandte Physik, TU Darmstadt — 4Institut für Quantenoptik, Leibniz Universität Hannover
The Mach-Zehnder interference signal of single and double Bragg diffraction is influenced by the multiport nature of the diffraction process [1]. Under appropriate conditions, higher-order path contributions can be neglected and just two or three paths are respectively relevant for single and double diffraction. Although the central path can contribute significantly to the exit-port population for double diffraction, the coherent overlap with the resonant paths is only small due to velocity selectivity effects.
Even when the two resonant paths are dominant for double Bragg diffraction, the interference signal due to a phase shift exhibits that the outer ports are shifted to each other. For three paths, we additionally observe a beating.
By summing over the two outer exit ports, one can define an effective port that is insensitive to these effects.
We analyze how this feature changes under gravity which cannot be completely compensated by frequency chirping in this case.
The QUANTUS project is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry of Economics and Energy (BMWi) under grant number 50WM1956 (QUANTUS V).
[1] Phys. Rev. A 101, 053610 (2020)