Simultaneous cooling the coupled nano-mechanical resonators in the strong optomechanical coupling regime

Abstract

Coupled nano-mechanical resonators (NRs) have recently attracted great attention for both practical applications and fundamental studies. As a preparation step, it is needed to cool the coupled NRs to their ground states. In this paper, we investigate the coupled mechanical resonators cooling by employing the covariance approach for the identical and nonidentical cases, special attention is paid to the strong optomechanical coupling regime. Using numerical investigations, we show that the two coupled NRs can be simultaneously cooled down to nearly the vibrational ground state with the strong optomechanical coupling with the RWA. For these reasons, our scheme may provide a new paradigm for the coherent manipulation of NRs in the strong optomechanical coupling regime.

Simultaneous cooling coupled nano-mechanical resonators in cavity optomechanics

“…Different from the classical properties of the mechanical systems at room temperature, the quantum properties of the mechanical systems are presented only at sufficiently low temperatures where the thermal fluctuations are suppressed. To suppress the thermal fluctuations of the mechanical systems and study their quantum properties, various ground-state cooling schemes have been proposed, such as cooling with dissipative coupling [25,26], quadratic coupling [27,28], resolved sideband cooling [29][30][31][32], the feedback cooling [33,34], including coherent feedback [35], cooling with static electrical interaction without any auxiliary qubit or photonic systems [36], hot thermal light cooling [37], time-dependent control cooling [38], measurement-based cooling [39], dynamic dissipative cooling [40], and quantum cooling in the strong [41] and weak [42] optomechanical-coupling regime. Experimentally, efficient cooling of a MR with high frequency ω m ≃ 2π × 6 GHz down to the ground state (with an average phonon number ⟨n⟩ ≃ 0.07) was achieved with a direct refrigerator of 25 mK [43].…”

Multi-outlet single photon quantum router between optics and microwave based on a hybrid optomechanical system

“…In recent years, optomechanical mechanics [1][2][3] and electromechanical mechanics [4][5][6] have developed rapidly, it is expected that many quantum effects in macroscopic material structures can be observed in these systems, such as quantum information conversion [7,8], regular mode splitting [9], optomechanically induced transparency [10,11], slow light [12], frequency conversion [13], etc. In addition, experiments in both microwave and optical fields have demonstrated that the NAMR can be cooled to the ground state of vibration [14,15] and operate in a strong coupling range [16,17]. Therefore, it is possible to use the interaction between phonon-photons to realize the energy * Author to whom any correspondence should be addressed.…”