On 7/06/2016 6:57 pm, Bruno Marchal wrote:
On 07 Jun 2016, at 04:24, Bruce Kellett wrote:
That is just playing with words, and Deutsch's approach reduces the
concept of "separate worlds" to meaninglessness -- the concept
becomes so fluid as to become useless. One is very much better
advised to limit the idea of separate worlds to the irreversibility
following a decohered interaction.
That does not exist. In principle quantum erasure is always possible.
In practice that is quickly impossible, but reason of BIG numbers, but
the wave, or the unitary evolution, is always reversible.
That is false. As I explained earlier in the post, decoherence into the
warm thermal environment will always result in IR photons. These escape
at the velocity of light and can never be captured to be returned --
this is an /in principle/ limitation on the possibility of
reversibility. Reversibility is possible only in very special and
tightly controlled situations. In general, the formation of distinct
worlds is irreversible in principle.
Bruce
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