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CAMP Seminar: Cavity Optomechanics: Manipulating the quantum state of light with a flexible mirror

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Tom Purdy, JILA, University of Colorado
When
04 February 2014 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
Contact Name
Contact Phone
814-863-3075
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Recent progress in the field of cavity optomechanics has demonstrated
quantum behavior in the mechanical modes of nanoscale to macroscopically sized object.  For instance, mechanical resonators have been laser cooled
to near their ground state, entangled with photons, and shown to be
subject to quantum measurement backaction.   Here I will present a
realization of a macroscopic continuous-measurement version of the famous
Heisenberg microscope thought experiment.  The vibrational motion of a membrane mechanical resonator is interferometrically measured.  The random
optical force from the shot noise of the measurement light shakes the
resonator, providing the quantum backaction necessary to satisfy the
Heisenberg uncertainty relation.  In this strong backaction regime, the
mechanical interaction is also useful to non-destructively measure and
manipulate the quantum state of light.  We demonstrate one of the
consequences of this process:  the generation of squeezed light.
Establishing membrane resonators as quantum resource for the manipulation
of light opens up the possibility of mechanically interconnecting optical
systems with other quantum systems.  In particular a hybrid device
coupling the microwave photons in superconducting circuit to optical
photons in a cavity via a common mechanical element has the potential to
facilitate the transfer of quantum states between these otherwise
incompatible elements.

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