Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.63: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG2

Laser and cavity cooling of a mechanical resonator with a nitrogen-vacancy center in diamond — •Luigi Giannelli¹, Ralf Betzholz¹, Laura Kreiner², Marc Bienert¹, and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany — ²Experimentalphysik, Universität des Saarlandes, 66123 Saarbrücken, Germany

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.