Measurement and feedback for cooling heavy levitated particles in low-frequency traps

L. S. Walker, G. R. M. Robb, A. J. Daley

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
8 Downloads (Pure)


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 nanomechanical resonators. Minimization 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.
Original languageEnglish
Article number063819
Number of pages9
JournalPhysical Review A
Issue number6
Publication statusPublished - 12 Dec 2019


  • cooling
  • trapping
  • ground-state cooling
  • light scattering
  • stochastic difference equations


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