[ExI] Cramer on impossibility of FTL communication

[Giulio Prisco]

On Wed, Sep 2, 2015 at 4:23 PM, John Clark <johnkclark at gmail.com> wrote:
> On Mon, Aug 31, 2015 Adrian Tymes <atymes at gmail.com> wrote:
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>> In this case, the problem seems to be the limited speed of transmission of
>> information about the information.If you entangle photons A and B, let B
>> travel away, then measure A, you know what B is...but your knowledge of it
>> is not immediately available where B is.  You can tell people, but that
>> itself does not travel faster than light.  As far as B and those around it
>> are concerned, B remains entangled until the light cone of your measurement
>> of A reaches them.Is that not the case?
>
> A
> lthough influences can be transferred faster than light this can not be used
> to send a message. Think of quantum entanglement as 2 entangled coins, I
> have one and you have the other, no matter how far apart we are if I flip my
> coin and it comes up heads then when you flip your coin it will always come
> up heads, if my coin is tails then so will your coin be when you flip it. As
> marvelous as this fact is there is no way I can use the coins to send you a
> message because I have no control over my coin, it could come out heads or
> tails, so you see just randomness in the coin toss just like I do. It is
> only when we communicate through conventional means (at the speed of light
> or less) do we realize that my apparently random sequence of coin tosses and
> your apparently random sequence of coin tosses are identical. And you need
> more than that to send a message.

Right, and he "magic" only works if the coins are tossed. If you try
to cheat and send me a message, for example you lay your coin on the
table with heads or tails up, the spell is broken.

>
>  John K Clark
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