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TT: Fachverband Tiefe Temperaturen
TT 5: Micro Mechanical Oscillator 1 (jointly with Q)
TT 5.1: Vortrag
Montag, 14. März 2011, 10:30–10:45, HSZ 02
Listening to the Quantum Drum: Mechanics in its Ground State — •Tobias Donner1,2, John Teufel3, Ray Simmonds3, and Konrad Lehnert2 — 1Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland — 2JILA, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309, USA — 3National Institute of Standards and Technology, Boulder, CO 80305, USA
A mechanical resonator is a physicist's most tangible example of a harmonic oscillator. If cooled to sufficiently low temperatures a mechanical oscillator is expected to behave differently to our classical perception of reality. Examples include entanglement and superposition states where a macroscopic, human made object can be in two places at once. Observing the quantum behavior of a mechanical oscillator is challenging because it is difficult both to prepare the oscillator in a pure quantum state of motion and to detect those states. I will present experiments in which we couple the motion of a micro-fabricated oscillator to the microwave field in a superconducting high-Q resonant circuit. The displacement of the oscillator imprints a phase modulation on the microwave field which we detect with a nearly shot-noise limited interferometer. We employ the radiation pressure force of the microwave photons to cool the mechanical oscillator to its motional ground state.