Single-world interpretation, 6.2.2

Information lost, 5

In the Many-worlds interpretation (MWI), when we say that “a + b” collapses to “a”, there is a shift of definition of “you”.

MWI is in one sense correct: choice b version of you still exists. But the trick is that he is not in another universe. He is in the environment of this universe.

And perhaps in reverse, you are also part of the environment of him.

— Me@2011.11.20

This environment theory is not totally accurate. For example, in the photon double slit experiment, during the wave function collapse, 

sqrt(2) | left > + sqrt(2) | right >

–> | left >    ,

| right > as the unchosen choice, or the lost information, goes to the environment.      

However, the macroscopic reality of | photon goes left > requires not only the state of the photon but also the state of its environment, including the lost information | right >_micro. Just the lost information itself is not enough to form a macroscopic reality.

— Me@2012.04.03

2012.11.16 Friday (c) All rights reserved by ACHK