Amazing stuff!
I bet former KGB agent Putin the Terrible is doing this every day aping Nero, who watched Rome burning!
"... According to the study published in Physical Review Letters, the developed setup includes multiple laser emitters that enable super-resolution imaging of targets as small as millimeters in scale from a 1.36 kilometers (0.85 miles) distance in an outdoor urban environment. The device successfully images letter-shaped physical targets measuring 8×9 mm, with letter widths of 1.5 mm, placed at the far end of its imaging range. ..."
From the abstract:
"Long baseline diffraction-limited optical aperture synthesis technology by interferometry plays an important role in scientific study and practical application. In contrast to amplitude (phase) interferometry, intensity interferometry—which exploits the second-order coherence of thermal light—is robust against atmospheric turbulence and optical defects. However, a thermal light source typically has a broadband spectrum, a low average photon number per mode, and a wide divergence angle, forestalling extended applications.
Here, we propose and demonstrate active intensity interferometry for optical synthetic aperture imaging over the kilometer range. Our scheme employs multiple phase-independent laser emitters to generate thermal illumination and utilizes a flexible computational algorithm for image reconstruction.
Through outdoor experiments, we have successfully imaged millimeter-scale targets located at 1.36 km away, achieving a resolution enhancement by about 14 times over the diffraction limit of a single telescope. The application of long-baseline active intensity interferometry holds promise for advancing high-resolution optical imaging and sensing."
Active Optical Intensity Interferometry (no public access)
Super-resolution imaging based on active optical intensity interferometry (this seems to be the preprint version, open access)
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