Nonlocal inelastic scattering of light: Enhanced and noiseless signals in remote-coupled optomechanical systems

The inelastic scatterings of matter systems, such as Raman scattering, contain rich information on mechanical vibrations like as resonant frequencies, which lead to various applications, for example, a sensor for specific molecules. However, observing output signals requires a sensitive setup because an inelastic signal is inherently weak and is disturbed by strong input. In this study, we theoretically investigate a physical scheme to avoid detrimental impact of the input by distancing it from the emitter and greatly enhancing the output signals. If two bodies are coupled mechanically and direct optical communication is forbidden, the nonlocal inelastic scattering signals can be considerably boosted. We demonstrate this mechanism by considering coupled optomechanical systems as a typical example that enables control of the two-body interaction strength. The results present a general scheme to boost nonlocal inelastic scattering for noiseless and pure signals.