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Frequency‐Modulation‐Enhanced Ground‐State Cooling of Coupled Mechanical Resonators
Author(s) -
Guan SiYu,
Wang DongYang,
Bai ChengHua,
Yang JunYa,
Gao XiaoYuan,
Zhu AiDong,
Wang HongFu
Publication year - 2019
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201900193
Subject(s) - sideband , resonator , coherence (philosophical gambling strategy) , physics , ground state , resolved sideband cooling , modulation (music) , frequency modulation , optics , acoustics , mechanics , laser cooling , quantum mechanics , radio frequency , computer science , telecommunications , laser , microwave
The coupled mechanical resonators (MRs) are the prominent candidate for studying macroscopic quantum coherence. The prerequisite for observing macroscopic mechanical coherence is cooling the MRs to their ground state. Here, a theoretical scheme is proposed for improving the cooling of two coupled MRs by imposing frequency modulation (FM) upon the system to suppress the Stokes heating processes. By the methods of covariance analysis and numerical simulations, it is demonstrated that the cooling of double MRs can be realized in both stable and unstable regions with high efficiency compared to the cooling without FM, even if in unresolved sideband (USB) regime. By modulating the parameters appropriately, the cooling efficiencies of two MRs can be flexibly adjusted.