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GR: Fachverband Gravitation und Relativitätstheorie
GR 22: Experimentelle Tests
GR 22.1: Vortrag
Freitag, 2. März 2012, 15:20–15:40, ZHG 002
qBounce - a realization of the Quantum Bouncer with ultra-cold neutrons — Hartmut Abele1, Thomas Bittner1, •Gunther Cronenberg1, Hanno Filter1, Peter Geltenbort2, Tobias Jenke1, Kevin Mitsch1, and Martin Thalhammer1 — 1Atominstitut TU Wien, Wien, Österreich — 2Institut Laue-Langevin, Grenoble, Frankreich
We present the observation of a quantum bouncing ball in the gravitational field of the Earth. Quantum states in the Earth's gravitational field can be observed, when ultra-cold neutrons fall under gravity.
In our previous experiment in collaboration with the Institute Laue-Langevin/Grenoble, the lowest stationary quantum state of neutrons in the Earth's gravitational field was clearly identified. In the new experiment qBounce, we use this technique to prepare a neutron in the ground state and then to let it fall and bounce off a neutron mirror. Oscillations in time similar to the harmonic oscillator system described by Glauber states have been observed. Such a quantum particle bouncing in a linear gravitational field is known as the quantum bouncer. The motivation of this activity is also the investigation of quantum phases and quantum decoherence. For that matter we have developed position-sensitive neutron detectors with an extra-high spatial resolution.