[extropy-chat] Is Many Worlds testable?

[Damien Broderick]

At 12:18 AM 12/29/2006 +0100, Serafino wrote:

>I've got the impression that Deutsch thinks
>that the knowledge of the 'which way', or the consciousness
>of the knowledge of the 'which way', or the possibility
>of knowledge of the 'which way' the particle took,
>erases the interference pattern. Well, this is not
>true. It is not 100% true. It is only partially true.

My lay understanding is the third option above. The very 
*possibility* of decohering the superposed states causes the 
splitting. This is very strange, especially when it can be 
subsequently erased. (I think Cramer's story helps deal with this.) 
But what do you mean by "partially true"? Thin and unconvincing fringes? :)

Damien Broderick