On 5/4/2018 12:07 PM, agrayson2...@gmail.com wrote:
Unfortunately, it is not the case that you can implement
absolutely any unitary transformation in this way. For instance,
you cannot implement the unitary transformation that would reverse
a totally decohered event.
*If the decoherence was unitary, why can't the process be reversed
statistically, analogous to the case of the classical cooling gas
where we imagine the hugely improbable incoming and absorption of the
previously outgoing IR photons? AG*
It's mathematically reversible, but it's not reversible by you or any
combination of powers in this world no matter how magical because this
world is orthogonal to other worlds that contain the information you
would need to reverse it. Which is why I suggested this be called
nomologically irreversible.
Brent
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