There's an interesting discussion of the physics of transporter beams in section 23.9 of Penrose's The Road to Reality
. Among other things, Penrose points out that teleportation is, in principle, achievable by sufficiently ingenious use of quantum entanglement. It requires, however, that the original is destroyed, since an ability to create perfect copies would violate Heisenberg Uncertainty: by creating enough copies, you could pin down the quantum state as accurately as you wanted, an impossibility.
Is any of this discussed in Krauss's book? I'm curious.