An experimental investigation of quantum frequency correlations resilience against white and colored noise

Quantum technologies based on photons rely on correlated pairs generated through nonlinear optics. Hence, understanding the impact of disturbances is of paramount importance for the development of this innovative field. Here we focus on the quantum spectroscopy as one of the most promising quantum technique showing a realistic perspective for a future employment. In this field, the most interesting disturbance is represented by the frequency noise. We present an experiment aimed at testing and characterizing the resilience against different levels of white and colored noise and we include simulations to generalize our findings. With this work we demonstrate that the spectroscopical properties of both the target and the noise, as well as the strength of the quantum correlations, play a crucial role and could have e huge impact on the performances, especially in terms of achievable spectral resolution. Remarkably, the presence of a specific region where the technology is always robust against any kind of noise represents an advantage allowing to deal with optimal measurements and fully exploit the capabilities of this technology.