Quantum Theory of Transmission Line Resonator-Assisted Cooling of a   Micromechanical Resonator
  We propose a quantum description of the cooling of a micromechanical flexural oscillator by a one-dimensional transmission line resonator via a force that resembles cavity radiation pressure. The mechanical oscillator is capacitively coupled to the central conductor of the transmission line resonator. At the optimal point, the micromechanical oscillator can be cooled close to the ground state, and the cooling can be measured by homodyne detection of the output microwave signal. 
Yong Li, Ying-Dan Wang, Fei Xue, and C. Bruder