Coherent mechanical noise cancellation and cooperativity competition in optomechanical arrays

Abstract

We study a multi-resonator optomechanical system, consisting of two SiN membranes coupled to a single optical cavity mode. Correlations in the noise of the optomechanically coupled thermal baths lead to destructive interference, which we observe as a reduction in the mechanical noise power spectrum by up to 20 dB, close to the mechanical resonance frequencies. We show that this effect can be controlled by adjusting the optomechanical interaction strength between the resonators, and that it originates from the frequency shift of the optomechanically scattered photons that provide the effective mechanics-mechanics coupling. Based on this effective coupling, we also propose, derive and measure a collective effect, cooperativity competition on mechanical dissipation, which causes the optomechanically broadened linewidth of one resonator to depend on the coupling efficiency (cooperativity) of the other resonator.

Zeptonewton force sensing with squeezed quadratic optomechanics

“…Further integrating it with an intracavity squeezing medium can lead to further enhancement of force sensitivity, reaching the zeptonewton level. This opens new prospects of making and using quantum nonlinear COM sensors in fundamental physics experiments and in a wide range of practical fields requiring extreme sensitivity [92][93][94][95] .…”

Coupling of QD-based PhC nanocavity with two mechanical modes: an approach to tunable optical switching and sensing applications

“…When multi-mechanical resonators are constructed inside an optical cavity, cooperative response, switching properties, improved interactions, and nontrivial characteristics emerge [33][34][35][36][37][38][39][40]. In particular, one can create and manipulate the coherent exchange of excitations [41][42][43][44] or analyse selfoscillations and synchrony via dynamical interactions in the context of two or more mechanical resonators [45][46][47]. This article focuses on an OM system consisting of two nanomechanical resonators (NRs) in a high-Q PhC cavity.…”

Dynamic Brillouin cooling for continuous optomechanical systems

“…Preparing a single mode mechanical oscillator into its quantum ground state has been experimentally realized in cavity optomechanical systems [10] by utilizing the technique of sideband cooling [11][12][13][14], which plays a central role in a host of novel quantum technologies, ranging from generation of nonclassical states [15][16][17] to quantum sensors [18] and quantum repeaters [19]. Beyond cooling single mechanical modes in cavity optomechanics, novel cooling technologies, for example, multimode cooling methods by using EIT [20], dark-mode control [21], cold-damping feedback [22][23][24], synthetic magnetism [25], and quantum reservoir engineering [26], have been developed in recent years for extended platforms with many degrees of freedom, including multiple degenerate mechanical resonators [27][28][29][30][31], optomechanical arrays [32][33][34][35][36][37], optically levitated mechanical resonators [38,39], and waveguide-coupled resonators [40,41]. The intriguing limit of these cases is the ground-state cooling in continuous optomechanical systems [42,43].…”