Passive imaging with quantum advantage.

Fourier domain division (FDD) improves passive far-field optical microscopy by reducing shot-noise impact, yielding a fivefold increase in Fisher information for high spatial-frequency components.

• Why it matters: Far-field imaging’s low-pass filtering and shot noise from discrete quantum light suppress high spatial frequencies near the cutoff, limiting resolution in photon-starved conditions.
• What they did: The method optically preprocesses incoming light by partitioning the Fourier plane into multiple regions for independent detection, then reconstructs images using post-processing guided by quantum and classical Fisher information.
• The result: Compared with direct imaging, FDD reduces the photons needed to reach a target signal-to-noise ratio in the Fourier domain, enhancing resolution in the photon-starved regime.

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