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Q: Fachverband Quantenoptik und Photonik
Q 55: Matter Wave Optics
Q 55.8: Vortrag
Freitag, 13. März 2020, 12:45–13:00, a310
Non-perturbative treatment of quasi-Bragg diffraction phases for atom interferometry — •Jan-Niclas Siemß1,2, Florian Fitzek2, Sven Abend2, Ernst M. Rasel2, Naceur Gaaloul2, and Klemens Hammerer1 — 1Institut für Theoretische Physik, Leibniz Universität Hannover, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Germany
Bragg diffraction is a cornerstone of light-pulse atom interferometry. High-fidelity Bragg pulses for atomic sources with a finite velocity distribution typically operate in the quasi-Bragg regime. While enabling an efficient population transfer, the diffraction phase and its dependence on the pulse parameters are currently not well characterized despite playing a key role in the systematics of the interferometer.
In our work, we formulate Bragg diffraction in terms of scattering theory. We provide an intuitive understanding of the Bragg condition and derive a unitary scattering matrix in case of adiabatic driving with Gaussian pulses. We find, that perturbations of the adiabatic solution are well described by Landau-Zener physics. Furthermore, we include the effects of linear Doppler shifts applicable to narrow atomic velocity distributions on the scale of the photon recoil of the optical lattice.
As an illustration, with our comprehensive microscopic model we study diffraction phase shift fluctuations caused by laser intensity noise affecting the sensitivity of a Mach-Zehnder atom interferometer.
This work is supported by the CRC 1227 DQmat (A05) and by the VDI with funds provided by the BMBF under Grant No. VDI 13N14838 (TAIOL).