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SUMMARY:Levitated Optomechanics - Peter Barker (UCL)
DTSTART:20150216T153000Z
DTEND:20150216T170000Z
UID:TALK57884@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:The ability to engineer and control the macroscopic motion of 
 nano- and micro-mechanical oscillators has become an important tool in qua
 ntum science and technology. Key to the exploitation of these devices has 
 been the development of methods to cool them to their ground state[1]. Lev
 itation of a nanomechanical oscillator in vacuum\, such as an optically tr
 apped nanosphere\, removes many dissipation and decoherence pathways and l
 eads to extremely high mechanical quality factors[2]. This offers great pr
 omise for force sensing[3]\, for exploring the foundations of quantum mech
 anics at large mass scales and the possibility of creating large macroscop
 ic superpositions[4].  In this talk I will introduce levitated cavity opto
 mechanics and focus on the science and potential applications of levitated
  systems.  Finally\, I will describe our experiments that have cooled levi
 tated 200 nm silica spheres in vacuum by using a hybrid electro-optical tr
 ap.\n \n \n[1] J. D. Teufel\, J. D. et al.\, Sideband cooling of micromech
 anical motion to the quantum ground state. Nature 475\, 359 (2011) \n[2] D
 . E. Chang et al.\, Cavity opto-mechanics using an optically levitated nan
 osphere. Proc. Natl Acad. Sci. USA 107\, 1005 (2010) \n[3] A.A. Geraci\, S
 . B. Papp\, J. Kitching\, Short-Range Force Detection Using Optically Cool
 ed Levitated Microspheres. Phys. Rev. Lett. 105\, 101101 (2010) \n[4] M. A
 rndt and K. Hornberger\, Testing the limits of quantummechanical superposi
 tions. Nature Phys. 10\, 271(2014) \n[5] J. Millen\, T. Deesuwan\, P. F. B
 arker an J. Anders\, Nanoscale temperature measurements using non-equilibr
 ium Brownian dynamics of a levitated nanosphere Nature Nano. 9\, 425(2014)
 \n
LOCATION:Rutherford building\, Seminar Room B
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