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Light does some weird math

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12:20pm, October 9, 2007

Light is made of photons. Add a photon to a light pulse, then take one out, and you'd think you'd be back where you started. But in the world of quantum physics, things aren't so straightforward.

For one thing, quantum uncertainty means that a pulse doesn't necessarily have a well-defined number of photons. And acting on such a pulse may have counterintuitive consequences.

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