Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster: Quantum Optics and Photonics II

Q 27.29: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Correction of multifrequency dephasing in matter-wave interferometry — •Alexander Rembold, Georg Schütz, Andreas Günther, and Alexander Stibor — Institute of Physics and Center for Collective Quantum Phenomena in LISA⁺, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen

In various fundamental quantum mechanical experiments as well as in technical applications it is essential to achieve high contrast matter-wave interferograms. However, vibrations, electromagnetic oscillations and temperature drifts often dephase the matter wave and reduce the contrast. It complicates sensitive phase measurements such as in Aharonov-Bohm physics and decoherence studies. In opposition to decoherence, dephasing can in principle be reversed. Here we demonstrate a method for the analysis and reduction of the influence of dephasing noise and perturbations consisting of several external frequencies. Thereby, artificially perturbing oscillations are introduced in a biprism electron interferometer. The technique uses the high spatial and temporal resolution of a delay line detector to reveal and remove dephasing perturbations by second order correlation analysis. We provide a full theoretical description of the particle correlations where the significant parameters, such as the interference pattern periodicity and the contrast can be extracted from the disturbed interferogram. The method allows matter-wave experiments under perturbing laboratory conditions in electron, atom, ion, neutron and molecule interferometers. It decreases the efforts for shielding and vibrational or temperature stabilization and has applications in sensor technology.