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SUMMARY:Nonlinear optomechanical measurement of mechanical motion - Bowen\
 , W (University of Queensland)
DTSTART:20140807T103000Z
DTEND:20140807T113000Z
UID:TALK53660@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: George A. Brawley (Australian Centre for Engineere
 d Quantum Systems\, University of Queensland)\, Michael R. Vanner (Austral
 ian Centre for Engineered Quantum Systems\, University of Queensland)\, Si
 lvan Schmid (Department of Micro- and Nanotechnology\, Technical Universit
 y of Denmark\, Kongens Lyngby\, Denmark )\, Anja Boisen (Department of Mic
 ro- and Nanotechnology\, Technical University of Denmark\, Kongens Lyngby\
 , Denmark ) \n\nAn important goal in all facets of quantum optics is to be
  able to perform precise measurements of non-linear observables. This allo
 ws measurement-based non-classical state preparation\, which has been appl
 ied to great success in various physical systems\, and also provides a rou
 te for quantum information processing with otherwise linear interactions. 
 In cavity optomechanics much progress has been made using a linear interac
 tion and measurement\, but observation of nonlinear degrees-of-freedom\, s
 uch as phonon number\, remains outstanding. Here we report the observation
  of position-squared thermal motion of a micro-mechanical resonator by exp
 loiting the optical non-linearity of the radiation pressure interaction. U
 sing this measurement\, we conditionally prepare classical bi-modal mechan
 ical states of motion with feature sizes well below 100 pm. Future improve
 ments to our approach will allow the preparation of quantum superposition 
 states\, which can be used to experimentally explor e collapse models of t
 he wavefunction and the potential for mechanical-resonator based quantum-m
 etrology applications.\n\nRelated Links\n\nhttp://www.equs.org/ - ARC Cent
 re of Excellence for Engineered Quantum Systems\n\nhttp://www.physics.uq.e
 du.au/QOlab/ - Queensland Quantum Optics Lab\n\n
LOCATION:Seminar Room 1\, Newton Institute
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