> On 29 Apr 2018, at 19:50, Brent Meeker <meeke...@verizon.net> wrote:
> 
> 
> 
> On 4/29/2018 8:35 AM, Bruno Marchal wrote:
>> All computations can be done in a reversible way. The basic idea is that we 
>> can discard memories instead of erasing them, and that idea is coherent with 
>> physics and mechanism.
> 
> Because it is theoretically possible to do computations reversibly, doesn't 
> mean that they are done that way.  It is very difficult in practice, as the 
> developers quantum computers have found.  And even computations that are done 
> reversibly in a quantum computer then do not come to definite results.  We 
> are not conscious of superpositions.  So I stand by my point that 
> consciousness is a classical phenomenon.

No problem with this. I tend to believe that consciousness is classical too. My 
point was just that computation can be made in a reversible way. That has been 
proved by Hao Wang (a logician expert on Gödel) well before quantum 
computations.

And, no one doubt that it is very hard to do in practice, despite quantum 
topology and condensed matter physics is, imo, paving the way to it, but that 
might still take a long time. Electrons does not let themselves to be squeezed 
easily.

Bruno



> 
> Brent
> 
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