This is a reasonable account of teleporation.

LC

On Sunday, September 6, 2020 at 12:03:30 PM UTC-5 sce...@libero.it wrote:

> BTW I've found that quote by Vaidman.
> 'In the framework of the MWI, *the teleportation procedure does not move 
> the quantum state: the state was, in some sense, in the remote location 
> from the beginning*. The correlated pair, which is the necessary item for 
> teleportation, incorporates all possible quantum states of the remote 
> particle, and, in particular, the state which has to be teleported. The 
> local measurement of the teleportation procedure splits the world in such a 
> manner that in each of the worlds the state of the remote particle differs 
> form the state by some known transformation. The number of such worlds is 
> relatively small. This explains why the information which has to be 
> transmitted for teleportation of a quantum state—the information which 
> world we need to split into, i.e., what transformation has to be applied—is 
> much smaller than the information which is needed for the creation of such 
> a state. For example, for the case of a spin-1/2 particle there are only 4 
> different worlds, so in order to teleport the state we have to transmit 
> just 2 bits.' – Lev Vaidman in https://arxiv.org/abs/quant-ph/9810089 
>
> Il 06/09/2020 12:47 Bruce Kellett <bhkel...@gmail.com> ha scritto: 
>
>
> On Sun, Sep 6, 2020 at 6:55 PM 'scerir' via Everything List < 
> everyth...@googlegroups.com> wrote: 
>
> Bruce: "The idea of a large ensemble of pre-existing worlds that just get 
> distinguished by results has never been taken seriously by anyone outside 
> of this list. It has never been worked through in detail, and it is 
> doubtful if it even makes sense. It certainly has nothing to do with the 
> Schrodinger equation."
>
> Vaidman, speaking of quantum teleportation, 
> https://en.wikipedia.org/wiki/Quantum_teleportation , pointed out that 
> when Bob receives the message from Alice, he will know which of the four 
> states his particle is in, and using this information he performs a 
> unitary operation on his particle to transform it to the desired state. But 
> (as Vaidman pointed out) before Bob receives the message from Alice there 
> are four pre-existing equiprobable states, one of them (Bob doesn't know 
> which one) is already the right one. 
>
>
> Serafino, 
>  I am sorry to have to say this, but Lev Vaidman is something of an idiot 
> about these things. Don't take anything he says seriously, even though he 
> has been around for many years. This quote is irrelevant to my point. MWI 
> is incompatible with the Born rule. The Born rule makes sense only in 
> single world settings. 
>
> Bruce 
>
>
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