Decoherence apparently only works if a lot of degrees in the environment are measured with infinitely many copies reaching to all eternity. If too few memories and records survive with infinitely many copies for all eternity, would not their sparsity not contain enough coarse-grained information to determine the past history of humans? Can we have a macroscopic superposition of humans? If I don't remember something in my past, was I in a superposition in the past? The brain is hidden inside the skull. Decoherence is significant only if indirect records of internal brain states survive for all eternity? Does that mean the human brain is a quantum computer?
closed as not a real question by David Z♦ Jun 22 '11 at 17:04
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