If we walked around labs literally seeing human beings in a superposition of brain states, there would be no paradox. The "problem" comes in when we realize that we have never observed a full human being whose brain is in a superposition. Thus the Wigner's Friend experiment is made in order for us to ask WHY is it that we never see full human bodies and brains in superpositions?
Superficially, Wigner's Friend demonstrates a gap between what QM predicts about the world versus what is observed.
And I have come to bridge this gap by admitting that physics does indeed allow such things to exist in reality. We never see them because actually observing one is ridiculously vanishingly improble.
Let me give a more provencial example
Take a paddle wheel and attach a fishing line to it. Wrap it many times and take the string over a pulley and hand a 1 kg weight from the line. Place the paddle wheel into a tank of water. Drop the 1 kg mass and let it descend to the floor. the string will rotate the paddle wheel in the water slowly. And the 1 kg mass will gently land.
If the 1kg mass had been in free fall a lot more energy would be expended upon its collision with the floor. So some energy is "missing" here. as it turns out, the friction with the water in the tank is where the missing energy goes. The water will be ever slightly raised in temperature and energy is conserved.
The laws of physics perfectly permit the possibility that energy in warm water could turn a paddle wheel backwards and lift a weight off the floor. There is nothing in physics that strictly prohibits the water molecules from all accidentally lining up and turning the wheel.
We would observe the mass being lifted from the floor as the water gets cooler
Physics allows this.
You will never ever see it.
Not because it is "impossible" but because it is vanishingly unlikely to occur. 10 to the minus 10 to the minus 10 and so on
Circling back to Wigner's Friend ---- . A human brain made up of biological neuron cells in a network. Using energy, pushing salts through vesicles. A human brain is likened unto a gigantic network of paddle wheels and warm water tanks connected to each other . It is thermodynamically analogous but to a much vaster scale.
If the human brain were a thermodynamically reversible process, we would expect to see superpositinos of brain states. But we will never see them, because that is far less likely to occur than to see warm water accidentally turn a paddle in a water tank.
Nevertheless, the laws of physics certainly allow and permit a superposition of brain states.
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