What is the Wigner’s Friend thought experiment?
In: Physics
It helps if you understand quantum superposition first, and how observing it seems to change how the quantum partical/wave behaves. A thought experiment known as Schrödinger’s cat helps to illustrate this phenomenon. Then Wigner’s Friend expands on this thought experiment by illustrating that the observer of the experiment is caught up in the quantum superposition. The quantum can be a partical or a wave, but the observer might see a partical or a wave, so the observer of the observer notices both superpositions (the experiment AND the observer) in Wigner’s Friend.
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