Ultrahigh-speed optical encryption enabled by spatiotemporal noise chaffing.

ABSTRACT: Optical encryption provides strong physical-layer security but is limited by the slow response of spatial light modulators. We propose and experimentally demonstrate a spatiotemporal noise chaffing system inspired by the "chaffing and winnowing" principle for ultrahigh-speed temporal encryption. By exploiting the symmetric spatial properties and orthogonality of conjugated orbital angular momentum (OAM) states, high-speed temporal signals ("wheat") and spatial noise ("chaff") are simultaneously encoded. This mechanism suppresses information leakage by degrading the temporal signal-to-noise ratio while enabling authorized recovery. Furthermore, a variable-weight multimodal OAM (VW-multimodal OAM) scheme combined with a multimodal generation neural network (MGNN) exponentially expands the ke

SUBMITTER: Shi J 

PROVIDER: S-EPMC12630661 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature