Hannover 2013 – wissenschaftliches Programm
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SYQG: Symposium Quantum meets gravity and metrology
SYQG 2: Quantum meets gravity and metrology II
SYQG 2.1: Vortrag
Dienstag, 19. März 2013, 14:30–14:45, E 415
Differences between neutron and atom interferometry — •Enno Giese1, Daniel M. Greenberger2, Ernst M. Rasel3, and Wolfgang P. Schleich1 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm, Germany. — 2The City College of New York, 160 Convent Ave, New York, NY 10031, USA. — 3Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany.
Triggered by the controversy whether atom interferometers are sensitive to relativistic effects such as the red shift, the difference between neutron and atom interferometers drew our attention. In contrast to a the first naive guess, subtle distinctions can be found. In general, the difference between these two types of interferometers can be traced back to the different scattering processes. A conventional neutron interferometer uses crystals as beam splitters and mirrors. This scattering mechanism can be understood in terms of conventional Bragg diffraction.
In contrast to that, a variety of scattering mechanisms can be applied to atom interferometers. In this talk, we focus on atomic Bragg scattering, where the atoms interact with a standing light wave and change just their external degree of freedom. We show that by a careful arrangement and tuning of the lasers this diffraction process can be changed so that a neutron interferometer is mimicked. The phases accumulated along both paths are different in comparison to the usual atom interferometer which leads to a measurable phase shift.