> On 6 Sep 2020, at 19:58, Lawrence Crowell <goldenfieldquaterni...@gmail.com> 
> wrote:
> 
> This is a reasonable account of teleporation.

I agree too, … except for minor technical details (already discussed with 
Bruce, and I guess Bruce will not be convinced by Vaidman, nor by my slight 
corrections, which is mainly that a quantum state always refer to infinity of 
worlds/histories/relative-states).

Bruno


> 
> 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 
> <https://arxiv.org/abs/quant-ph/9810089>
> 
> 
>> Il 06/09/2020 12:47 Bruce Kellett <bhkel...@gmail.com 
>> <applewebdata://50A0A1F1-1404-4380-96C5-FA0AE9424ABD>> ha scritto:
>> 
>> 
>> On Sun, Sep 6, 2020 at 6:55 PM 'scerir' via Everything List < 
>> everyth...@googlegroups.com 
>> <applewebdata://50A0A1F1-1404-4380-96C5-FA0AE9424ABD>> 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 
>> <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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