Noise-enabled transparency in optically pumped atomic magnetometers

Non-Gaussian low-frequency noise, such as random telegraph noise (RTN), is widely present in quantum sensing systems and is usually regarded as the main perturbation limiting sensitivity and stability. However, whether it can be transformed into a usable spectroscopic resource still lacks systematic experimental verification. We demonstrate <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mi mathvariant="normal">Ξ</a:mi> </a:math> - and <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"> <d:mi mathvariant="normal">Λ</d:mi> </d:math> -type noise-induced transparency (NIT) effects in an optically pumped atomic magnetometer coupled to non-Gaussian RTN reservoirs, showing that NIT arises from interference between stochastic transition channels in spins, both theoretically and experimentally. In the <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:mi mathvariant="normal">Ξ</g:mi> </g:math> -type configuration, the spectral splitting driven by RTN exhibits a significant change in the transparency window, and the relationship between dynamic criticality and observable spectral structure is elucidated by the correlation between the Liouvillian exceptional point and the resolvable spectral-splitting threshold. In the <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:mi mathvariant="normal">Λ</j:mi> </j:math> -type configuration, the interference effect of amplitude-dependent noise enables the transparency effect to be stably manifested under weak noise, providing a calibrable noise-amplitude readout mechanism. These results extend magnetometer spectra from noise suppression to probing noise with noise, providing a new approach for non-Gaussian noise measurement and adaptive background-noise sensing.