Measurement and feedback for cooling heavy levitated particles in low-frequency traps
Measurement and feedback for cooling heavy levitated particles in low-frequency traps
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DOI：
10.1103/physreva.100.063819
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
L. S. Walker;G. Robb;A. Daley
中科院分区：
文献类型：
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作者：
L. S. Walker;G. Robb;A. Daley
我们考虑一个可能的路线，基态冷却的悬浮纳米粒子，磁性捕获的强永磁体，使用测量和反馈的组合。该系统的陷阱频率远低于那些涉及捕获离子或纳米机械谐振器。因此，环境加热的最小化是具有挑战性的，因为它需要在与陷波频率的倒数相当的时间尺度上控制系统。我们表明，这些陷阱是一个很好的平台，通过实时状态估计进行最佳反馈控制，准备可测量的量子特性的运动状态。
We consider a possible route to ground state cooling of a levitated nanoparticle, magnetically trapped by a strong permanent magnet, using a combination of measurement and feedback. The trap frequency of this system is much lower than those involving trapped ions or nano-mechanical resonators. Minimisation of environmental heating is therefore challenging as it requires control of the system on a timescale comparable to the inverse of the trap frequency. We show that these traps are an excellent platform for performing optimal feedback control via real-time state estimation, for the preparation of motional states with measurable quantum properties.