On 10/10/2013 5:36 PM, LizR wrote:
On 11 October 2013 13:06, meekerdb <meeke...@verizon.net <mailto:meeke...@verizon.net>> wrote:

    On 10/10/2013 1:36 PM, LizR wrote:

        Both M and W man would have a continuous feeling of identity with H 
man. I don't
        see that you two really have opposing viewpoints, although as usual I 
may be
        missing something.

        Of course if the brain can't be considered digital at any level (as 
        suggests) then this is actually impossible, and the question doesn't 
arise. But
        personally I'm not about to embrance the idea that the universe is 
analogue all
        the way down - with the problems that causes (like the "ultraviolety
        catastrophe") - and if it's digital at any level, this will work.

    Even if it's digital it can't be cloned at the quantum level.  So the 
    couldn't be implemented if copying all the way down to the quantum state 
    necessary.  But I don't think this is the case.  Tegmark, among others, has 
    that the brain is too hot to maintain quantum superpositions - so we can 
    assume that classical copying is enough, with at worst a little loss of 
short term
    memory.  It's interesting to consider though how accurate the copying would 
have to
    be for Bruno's question to make sense. Suppose the M and W man only 
retained a
    random 10% of the H man's memories?

That is the famous "substitution level". However, even if it did require the quantum states to be duplicated, which the universe doesn't allow, if we think the MWI is correct we can still ask the same questions using the duplication that creates. E.g. suppose we have Helsinki man enter a room and then we perform a quantum measurement, and as a result we either send the room to Moscow or Washington by conventional means. Or we open one of two doors, say, which lets him go to room 1 or room 2, and beforehand we ask him what are the chances you will end up in room 1? He says 50%, I imagine, but we know he ends up in both.

According to the paper I posted, even if we flipped a coin, the outcome would constitute a quantum measurement. But as for knowing there's a duplication: Only if we know MWI, an interpretation we made up, is true.


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