On Friday, May 4, 2018 at 9:44:49 PM UTC, Brent wrote:
>
>
>
> On 5/4/2018 12:07 PM, agrays...@gmail.com <javascript:> 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
>

*I don't buy this argument. Since those other worlds don't exist, one 
cannot speak of information lost to them. AG *

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