skip to content
 

Nonlinear optomechanical measurement of mechanical motion

Presented by: 
W Bowen University of Queensland
Date: 
Thursday 7th August 2014 - 11:30 to 12:30
Venue: 
INI Seminar Room 1
Abstract: 

Co-authors: George A. Brawley (Australian Centre for Engineered Quantum Systems, University of Queensland), Michael R. Vanner (Australian Centre for Engineered Quantum Systems, University of Queensland), Silvan Schmid (Department of Micro- and Nanotechnology, Technical University of Denmark, Kongens Lyngby, Denmark ), Anja Boisen (Department of Micro- and Nanotechnology, Technical University of Denmark, Kongens Lyngby, Denmark )

 

An important goal in all facets of quantum optics is to be able to perform precise measurements of non-linear observables. This allows measurement-based non-classical state preparation, which has been applied to great success in various physical systems, and also provides a route for quantum information processing with otherwise linear interactions. In cavity optomechanics much progress has been made using a linear interaction and measurement, but observation of nonlinear degrees-of-freedom, such as phonon number, remains outstanding. Here we report the observation of position-squared thermal motion of a micro-mechanical resonator by exploiting the optical non-linearity of the radiation pressure interaction. Using this measurement, we conditionally prepare classical bi-modal mechanical states of motion with feature sizes well below 100 pm. Future improvements to our approach will allow the preparation of quantum superposition states, which can be used to experimentally explor e collapse models of the wavefunction and the potential for mechanical-resonator based quantum-metrology applications.

Related Links

•http://www.equs.org/ - ARC Centre of Excellence for Engineered Quantum Systems

•http://www.physics.uq.edu.au/QOlab/ - Queensland Quantum Optics Lab

The video for this talk should appear here if JavaScript is enabled.
If it doesn't, something may have gone wrong with our embedded player.
We'll get it fixed as soon as possible.
Presentation Material: 
University of Cambridge Research Councils UK
    Clay Mathematics Institute The Leverhulme Trust London Mathematical Society Microsoft Research NM Rothschild and Sons