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- 摘要
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- 实验方案
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Double-passage mechanical cooling in a coupled optomechanical system
摘要： We consider a three-mode optomechanical system where two cavity modes are coupled to a common mechanical oscillator. We focus on the resolved sideband limit and illustrate the relation between the significant parameters of the system and the instantaneous-state mean phonon number of the oscillator optical coupling set up a correlation between the two cavity modes, which has significant effect on the cooling process. Using numerical solutions, we find that the inter-cavity coupling will decrease the cooling effect when both cavities have the same effective optomechanical coupling. However, when the effective optomechanical couplings are different, the cooling effect will be strongly improved by selecting appropriate range of inter-cavity coupling.
关键词： Ground-state cooling,Optomechanical system,Quantum optics
更新于2025-09-19 17:13:59
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Resolved-Sideband Cooling of a Levitated Nanoparticle in the Presence of Laser Phase Noise
摘要： 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 Tmin ? 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.
关键词： levitated nanoparticle,laser phase noise,resolved sideband cooling,ground state cooling,optomechanical cooling
更新于2025-09-16 10:30:52
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Improving the cooling of a mechanical oscillator in a dissipative optomechanical system with an optical parametric amplifier
摘要： The ground-state cooling of a macroscopic mechanical oscillator is a crucial prerequisite for implementing the quantum manipulation of the mechanical oscillator. Here we show that a degenerate optical parametric amplifier (OPA) can significantly improve the cooling of the mechanical membrane in the purely dissipative coupling system in the unresolved sideband regime. In the presence of the OPA with a parametric phase π/2, the mechanical membrane can be cooled from room temperature 293 K to 10 mK, a factor of 112 lower than that in the absence of the OPA. If the mechanical oscillator is precooled to 0.1 K, the mechanical membrane can be cooled into the microkelvin regime.
关键词： optical parametric amplifier,dissipative optomechanical system,ground-state cooling,mechanical oscillator
更新于2025-09-04 15:30:14