This is Crazy: Scientists See Two Versions Of Reality Existing At The Same Time In A Quantum Experiment

The setting of the experiment, dubbed "Wigner's Friend," is not too difficult. You begin with a quantum system that is in superposition, which implies that both of its states exist concurrently up to the point of measurement. In this example, the polarisation (the axis on which a photon spins) is both horizontal and vertical.

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