ICFO Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860 Barcelona, Spain.
Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland.
Phys Rev Lett. 2019 Oct 11;123(15):153601. doi: 10.1103/PhysRevLett.123.153601.
We investigate the influence of laser phase noise heating on resolved sideband cooling in the context of cooling the center-of-mass motion of a levitated nanoparticle in a high-finesse cavity. Although phase noise heating is not a fundamental physical constraint, the regime where it becomes the main limitation in Levitodynamics has so far been unexplored and hence embodies from this point forward the main obstacle in reaching the motional ground state of levitated mesoscopic objects with resolved sideband cooling. We reach minimal center-of-mass temperatures comparable to T_{min}=10 mK at a pressure of p=3×10^{-7} mbar, solely limited by phase noise. Finally we present possible strategies towards motional ground state cooling in the presence of phase noise.
我们研究了激光相位噪声加热对悬浮纳米粒子在高精细度腔中质心运动的分辨边带冷却的影响。虽然相位噪声加热不是一个基本的物理限制，但在 Levitodynamics 中，它成为主要限制的区域迄今尚未被探索，因此从这一点出发，它成为用分辨边带冷却达到悬浮介观物体的运动基态的主要障碍。我们在压力为 p=3×10^{-7} mbar 时达到了与 T_{min}=10 mK 相当的最小质心温度，仅受相位噪声限制。最后，我们提出了在存在相位噪声的情况下实现运动基态冷却的可能策略。
