Scientific Results

Nonreciprocal ground-state cooling of multiple mechanical resonators

Year: 2020

Authors: Lai DG., Huang JF., Yin XL., Hou BP., Li WL., Vitali D., Nori F., Liao JQ

Autors Affiliation: Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Key Lab Matter Microstruct & Funct Hunan Prov, Dept Phys,Minist Educ, Changsha 410081, Peoples R China; Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Peoples R China; RIKEN, Theoret Quantum Phys Lab, Saitama 3510198, Japan; Sichuan Normal Univ, Coll Phys & Elect Engn, Inst Solid State Phys, Chengdu 610068, Peoples R China; Univ Camerino, Sch Sci & Technol, Phys Div, I-62032 Camerino, MC, Italy; INFN, Sez Perugia, I-06123 Perugia, Italy; CNR INO, Largo Enrico Fermi 6, I-50125 Florence, Italy; Univ Michigan, Phys Dept, Ann Arbor, MI 48109 USA

Abstract: The simultaneous ground-state cooling of multiple degenerate or near-degenerate mechanical modes coupled to a common cavity-field mode has become an outstanding challenge in cavity optomechanics. This is because the dark modes formed by these mechanical modes decouple from the cavity mode and prevent extracting energy from the dark modes through the cooling channel of the cavity mode. Here we propose a universal and reliable dark-mode-breaking method to realize the simultaneous ground-state cooling of two degenerate or nondegenerate mechanical modes by introducing a phase-dependent phonon-exchange interaction, which is used to form a loop-coupled configuration. We find an asymmetrical cooling performance for the two mechanical modes and expound this phenomenon based on the nonreciprocal energy transfer mechanism, which leads to the directional flow of phonons between the two mechanical modes. We also generalize this method to cool multiple mechanical modes. The physical mechanism in this cooling scheme has general validity and this method can be extended to break other dark-mode and dark-state effects in physics.

Journal/Review: PHYSICAL REVIEW A

Volume: 102 (1)      Pages from: 011502  to: 011502

KeyWords: NON-RECIPROCITY; QUANTUM; ENTANGLEMENT; OSCILLATOR; SYSTEMS
DOI: 10.1103/PhysRevA.102.011502

Citations: 20
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-12-05
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