November 17 2016

New article: Laser and cavity cooling of a mechanical resonator with a nitrogen-vacancy center in diamond

Our article Laser and cavity cooling of a mechanical resonator with a nitrogen-vacancy center in diamond has been published in the 1 November 2016 issue of Physical Review A (Vol.94, No.5).

Laser and cavity cooling of a mechanical resonator with a nitrogen-vacancy center in diamond

Luigi Giannelli, Ralf Betzholz, Laura Kreiner, Marc Bienert, and Giovanna Morigi
Phys. Rev. A 94, 053835

We theoretically analyze the cooling dynamics of a high-Q mode of a mechanical resonator, when the structure is also an optical cavity and is coupled with a nitrogen-vacancy (NV) center. The NV center is driven by a laser and interacts with the cavity photon field and with the strain field of the mechanical oscillator, while radiation pressure couples the mechanical resonator and cavity field. Starting from the full master equation we derive the rate equation for the mechanical resonator's motion, whose coefficients depend on the system parameters and on the noise sources. We then determine the cooling regime, the cooling rate, the asymptotic temperatures, and the spectrum of resonance fluorescence for experimentally relevant parameter regimes. For these parameters, we consider an electronic transition, whose linewidth allows one to perform sideband cooling, and show that the addition of an optical cavity in general does not improve the cooling efficiency. We further show that pure dephasing of the NV center's electronic transitions can lead to an improvement of the cooling efficiency.



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