2018/08/09 by Dong-Yang Wang, Dongyang Wang, Cheng‐Hua Bai +5
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Coupling (piping) #Laser cooling #Limit (mathematics) #Mechanical and Optical Resonators #Modulation (music) #Phonon #Photonic and Optical Devices #Physics #Quantum #Quantum electrodynamics #Quantum limit #Quantum mechanics #Resolved sideband cooling #quant-ph
paper · pdf · doi:10.1103/physreva.98.023816
published as Physical Review A 98, 023816 (2018)
openalex publication_date 2018/08/09 · openalex created_date 2018/08/22 · arxiv created 2018/11/14 · arxiv updated 2018/11/21 · openalex updated_date 2026/08/05
In the usual optomechanical cooling, even if the system has no thermal component, it still has a quantum limit---known as the quantum backaction limit (QBL)---on the minimum phonon number related to shot noise. By studying the side-band cooling regime in optomechanical systems (OMSs), we find that the cooling can be improved significantly when the frequency modulation (FM) that can suppress the Stokes heating processes is introduced into the system. We analyze and demonstrate the reasons of the phonon number below the QBL redefined in the whole stable region of the standard OMSs. The above analyses are further checked by numerically solving the differential equations of second-order moments derived from the quantum master equation with broad system parameters, ranging from weak coupling to ultrastrong coupling and resolved-side-band to unresolved-side-band regimes. Comparing with the cases of those without FM, the stable ground-state cooling can also be achieved even in the conventional unstable region.