Approaching the quantum resolution limit for two partially coherent optical point sources

Lin Zhou; Ben Wang; Yan Li; Weiji He; Lijian Zhang

doi:10.1117/12.2691802

6 November 2023 Approaching the quantum resolution limit for two partially coherent optical point sources

Lin Zhou, Ben Wang, Yan Li, Weiji He, Lijian Zhang

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129214G (2023) https://doi.org/10.1117/12.2691802
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

We discuss the quantum-limited resolution of two partially coherent point sources. By establishing the Cramér-Rao bound for measuring the transverse separation of the sources, we show that the precision limit for resolving two points can be greatly improved in the sub-Rayleigh region. Here, we use a Digital Micromirror Devices (DMD) to demonstrate a new measurement scheme called spatial-mode demultiplexing (SPADE), which projects the input light field into different spatial modes. By analyzing the noise model of EMCCD, we measure the intensity of different modes of HG and estimate the separation between two partially coherent sources. Compared with direct imaging, our implementation of SPADE can surpass the Rayleigh limit and approach the quantum limit given by Quantum Fisher Information (QFI) over a range. Our result provides a new vision for super-resolution imaging. It is of great potential in imaging fields such as optical astronomy and fluorescence microscopy.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lin Zhou, Ben Wang, Yan Li, Weiji He, and Lijian Zhang "Approaching the quantum resolution limit for two partially coherent optical point sources", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129214G (6 November 2023); https://doi.org/10.1117/12.2691802

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