Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Quantum Coherence and Quantum Information Systems I

TT 3.8: Vortrag

Montag, 26. März 2007, 11:45–12:00, H20

Quantum Theory of Cavity-Assisted Sideband Cooling of Mechanical Motion — •Florian Marquardt¹, Joe P. Chen², Aashish A. Clerk³, Jack G. E. Harris², and Steven M. Girvin² — ¹Arnold Sommerfeld Center for Theoretical Physics, Department für Physik und Center for NanoScience, Ludwig-Maximilians Universität München, Germany — ²Department of Physics, Yale University, New Haven, USA — ³Department of Physics, McGill University, Montreal, Canada

We present a fully quantum theory describing the cooling of a cantilever coupled via radiation pressure to an illuminated optical cavity. Applying the quantum noise approach to the fluctuations of the radiation pressure force, we derive the opto-mechanical cooling rate and the minimum achievable phonon number. We find that reaching the quantum limit of arbitrarily small phonon numbers requires going into the good cavity (resolved phonon sideband) regime where the cavity linewidth is much smaller than the mechanical frequency and the corresponding cavity detuning. This is in contrast to the common assumption that the mechanical frequency and the cavity detuning should be comparable to the cavity damping.