A superresolution-enhanced spectrometer beyond the Cramer-Rao bound in phase sensitivity.

ABSTRACT: Precision measurement has been an important research area in sensing and metrology. In classical physics, the Fisher information determines the maximum extractable information from statistically unknown signals, based on a joint probability density function of independently and identically distributed random variables. The Cramer-Rao lower bound (CRLB) indicates the minimum error of the Fisher information, generally known as the shot-noise limit. On the other hand, coherence has pushed the resolution limit further overcoming the diffraction limit using many-wave interference strictly confined to the first-order intensity correlation. However, practical implementation is limited by the lithographic constraints in, e.g., optical gratings. Recently, a coherence technique of superresolution ha

SUBMITTER: Ham BS 

PROVIDER: S-EPMC11846865 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature