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SUMMARY:Quantum control and quantum synchronization - Andreas Nunnenkamp\,
  University of Cambridge
DTSTART:20160512T130000Z
DTEND:20160512T140000Z
UID:TALK65569@talks.cam.ac.uk
CONTACT:Tim Hughes
DESCRIPTION:Cavity optomechanics is a rapidly-growing field in which mecha
 nical degrees of freedom are coupled to modes of the electromagnetic field
  inside optical or microwave resonators. Adapting laser-cooling techniques
  from atomic physics several experiments have recently observed mechanical
  motion close to the quantum ground-state. This paves the way to exploit t
 hese systems for the engineering of phonon and photons at the nanoscale wi
 th exciting\, novel applications for science and technology [Phys. Today 6
 5\, 29 (2012)\, Rev. Mod. Phys. 86\, 1391 (2014)].\n\nAlong this line of t
 hought\, I will give an overview of recent research highlights and an outl
 ine of future directions. First\, I will show that feedback of homodyne me
 asurements can be used to suppress thermal and back-action noise and incre
 ase sideband asymmetry. As the feedback gain is increased\, the back-actio
 n from the amplified vacuum fluctuations will eventually limit the cooling
  efficiency and reduce the sideband asymmetry [arXiv:1602.05942]. I will t
 hen report on the realization of the so-called reversed dissipation regime
  of cavity optomechanics [arXiv:1602.05180] in which dissipation of the me
 chanical oscillator dominates over that of the electromagnetic modes [PRL 
 113\, 023604 (2014)]. Finally\, I will discuss synchronization in the simp
 le quantum-mechanical scenario of one harmonic self-oscillator [PRL 112\, 
 094102 (2014)] as well as one nonlinear self-oscillator [arXiv:1603.01409]
  coupled to an external drive.
LOCATION:Cambridge University Engineering Department\, LR6
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