Proposes low-pass filter control to lower phonon occupation number in trapped nanoparticles, suggesting a significant advantage over existing cooling methods.
We propose a low-pass-filter (LPF) feedback control for cooling a trapped particle with a low-pass filter, and show that it can achieve the minimum phonon occupation number lower than cold damping and linear-quadratic-Gaussian (LQG) control, which are the standard methods of ground-state cooling of a levitated nanoparticle. For the detection efficiency of $90%$, the achievable phonon occupation number with our LPF control is about one third and a half of that of cold damping and LQG control, respectively, and thus our method has a decisive advantage to reach the absolute ground state.
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Sugiura et al. (2025) studied this question.
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