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At low light levels, microscopic imaging systems suffer from noise as the few desired photons compete with random background. One would normally just turn up the illumination, but this can alter or even damage some delicate samples. A research team led by Yaron Silberberg at the Weizmann Institute of Science in Israel has found one possible way around this with specially constructed entangled quantum states. In a paper in Physical Review Letters, the researchers report a quantum microscope that produces relatively superior images compared to a conventional microscope at extremely low light level.

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