Once the person in the lab measures the photon, the particle assumes a fixed polarization. But for someone outside that closed laboratory who doesn't know the result of the measurements, the unmeasured photon is still in a state of superposition.
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https://www.livescience.com/65029-du...y-photons.html
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https://www.livescience.com/65029-du...y-photons.html
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