Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Matter wave optics I

Q 2.3: Vortrag

Montag, 17. März 2014, 11:00–11:15, DO26 208

Correction of dephasing oscillations in matter wave interferometry — •Alexander Rembold, Georg Schütz, Andreas Pooch, Andreas Günther, and Alexander Stibor — Physikalisches Institut, Universität Tübingen, 72076 Tübingen, Deutschland

Vibrations, electromagnetic oscillations and temperature drifts are among the main reasons for dephasing in matter wave interferometry. Sophisticated interferometry experiments often require integration times of several minutes. Here we present a scheme to suppress the influence of such dephasing mechanisms - especially in the low frequency regime - by analyzing temporal and spatial particle correlations available in modern detectors. Such correlations can reveal interference properties which would otherwise be washed out due to dephasing by external oscillating signals. The method is shown experimentally in a biprism electron interferometer [1] where artificially a perturbing oscillation is introduced by a periodically varying magnetic field. We provide a full theoretical description of the particle correlations where the perturbing frequency and amplitude can be revealed from the disturbed interferogram. The original spatial fringe pattern without the perturbation can thereby be restored. The technique can be applied to lower the general noise requirements in matter wave interferometers. It allows for the optimization of electromagnetic shielding and decreases the efforts for vibrational or temperature stabilization.

[1] F. Hasselbach and U. Maier, 1999 Quantum Coherence and Decoherence, Proc. ISQM, Tokyo 98, ed. by Y.A. Ono and K. Fujikawa (Amsterdam: Elsevier), 299 (1999)