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Alan Forrester[^1] [says ‘no’](https://physics.stackexchange.com/a/228643/197081):↵
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>‘no’](https://physics.stackexchange.com/a/228643/197081), the brain is not a *quantum* computer but a classical one:↵
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> Quantum mechanics has almost no bearing on the operation of the brain, except insofar as it explains the existence of matter. You say that signals are carried by electrons, but this is very imprecise. Rather, they are carried by various kinds of chemical signals, including ions. Those signals are released into a warm environment that they interact with over a very short timescale.
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