Dynamical Backaction of Microwave Fields on a Nanomechanical Oscillator

Abstract

We measure the response and thermal motion of a high-Q nanomechanical oscillator coupled to a superconducting microwave cavity in the resolved-sideband regime where the oscillator's resonance frequency exceeds the cavity's linewidth. The coupling between the microwave field and mechanical motion is strong enough for radiation pressure to overwhelm the intrinsic mechanical damping. This radiation-pressure damping cools the fundamental mechanical mode by a factor of 5 below the thermal equilibrium temperature in a dilution refrigerator to a phonon occupancy of 140 quanta.

4 pages, 4 figures

References in corpus (4)

• Quantum Theory of Cavity-Assisted Sideband Cooling of Mechanical Motion
• Passive Cooling of a Micromechanical Oscillator with a Resonant Electric Circuit
• Prospects for cooling nanomechanical motion by coupling to a superconducting microwave resonator
• Radiation-pressure self-cooling of a micromirror in a cryogenic environment