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Optics is the study of light, and its interaction with matter. It includes topics such as imaging systems, fiber optics, lasers, quantum optics, and more.

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One-way photon detector

I’m not sure if such a device exists, or if it could. Is it possible for a photon detector to be one-way? Like a one-way mirror, where one side can be seen through, but the other side is a mirror. Thi …
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