The explanation for how the transmitted people are reassembled
at the destination in the next to last chapter
of the “Black Rock” section (these chapters have
neither titles nor numbers) seems to me to miss a more
clever approach which would not affect the story in
any way (as the explanation never figures in subsequent events).
Instead of invoking other histories in the multiverse which
are able to reconstitute the time travellers (which raises
all kinds of questions about identity and continuity of
consciousness), why not simply argue that unitarity is preserved
only
across the multiverse as a whole, and that when
the quantum state of the transmitted object is destroyed in this
universe, it is
necessarily reassembled intact in the
destination universe, because failure to do so would violate
unitarity and destroy the deterministic evolution of the wave
function?
This is consistent with arguments for what happens to quantum
states which fall into a black hole or wormhole (on the assumption
that the interior is another universe in the multiverse), and
also fits nicely with the David Deutsch's
view of the multiverse and my
own ideas toward a
general theory of
paranormal phenomena.