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Theory of quantum optomechanics with unconventional nonlinear coupling schemes

Abstract : In recent years the zoology of tamed quantum systems has witnessed the arrival of a new member. In the field of optomechanical cavities it has been proven that it is possible to lead micro and nano mechanical resonators to their vibrational quantum ground state. This feat is made possible by the ability of optomechanical resonators to optically cool down the brownian motion of the mechanical degrees of freedom. We study the cooling mechanisms in optomechanical cavities subject to unconventional coupling schemes. In particular we discuss how photothermal cooling leads the mechanical resonator to its ground state in regimes of parameters for which the more usual radiation-pressure based cooling is unable to quench effectively enough the thermal brownian motion. On the other hand the maturity of experimental optomechanics has opened the path for the exploration of strong coupling regimes where a single photon is enough to modify the mechanical properties beyond the zero point fluctuations. Following this trend we present as well our predictions for a system combining quantum electrodynamics and quantum optomechanics. We show that by introducing an artificial two level atom inside the optomechanical cavity the cooling and amplification of mechanical motion are greatly modified. We also show how the intrinsic non-linearity of the artificial atom leads to non-classical states of the mechanical resonator.
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Contributor : Juan Restrepo <>
Submitted on : Monday, January 5, 2015 - 1:50:18 PM
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  • HAL Id : tel-01099806, version 1


Juan Restrepo. Theory of quantum optomechanics with unconventional nonlinear coupling schemes. Physics [physics]. Université Paris 7, Sorbonne Paris Cité, 2014. English. ⟨tel-01099806⟩



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