Question

Are all particles in the universe quantum-entangled on some level?

Answer 1

The CMB indicates the universe was in a thermal equilibrium early on, which I understand indicates causal connection. There appears to have been some rapid expansion, and the universe now appears to have parts that will always be out of causal contact from now on (as far as we can tell). Since entanglement is transferred, none of the "information" is lost just transferred during interactions.

Now if one measures the spin of a random free fermion to be spin up say, then I'm thinking the spin of all other fermions in the universe has an infinitesimally lower probability of being found to be spin up.

Such that if you could measure half the spins in the particles in the universe as up, you could be certain the other half would be measured to be spin down. This of course assumes a zero net spin for the universe. Is this line of thinking correct

Answer 2

HEY MATE ⭐⭐⭐
HERE'S THE ANSWER ✌
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All electrons in atoms are entangled. The symplest electronic entangled system is two electron system in Helium. All electrons in atomic cores are entangled. The quantum states of multielectron systems have been widely studied in atomic .

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