On 11/6/2024 12:40 PM, Alan Grayson wrote:
On Wednesday, November 6, 2024 at 11:31:03 AM UTC-7 John Clark wrote:
On Wed, Nov 6, 2024 at 4:23 AM Alan Grayson <[email protected]>
wrote:
/> An effect between entangled pairs but no information sent?
Doesn't make sense. AG/
*It's weird but it does not produce a logical contradiction.
Suppose you and I have quantum entangled coins, I stay on earth
but you get in your Spaceship and travel at nearly the speed of
light for a little over four years to Alpha Centauri, then you
slow down and start flipping your coin and I do the same on Earth.
We both write down a record of all the heads and tails we got and
both of us conclude that the sequences we got are perfectly
random. Then you get back in your spaceship and four years later
you're back home. And now that you're back we compare our lists
of "random" coin flips and we find that the two sequences are
identical, we both got the same "random" sequence.*
*That's very weird but neither of us noticed anything was strange
until you got back, and that took over four years because Alpha
Centauriis four light years away. If we try to use our coins
discern a message by Morse code with heads meaning a dot and tails
meaning a dash it won't work because your coin will only come up
the way you want it to 50% of the time.You could of course force
your coin to come up heads or tails, but if you did that you would
destroy the quantum entanglement because it is very delicate, and
then you would just have two ordinary unrelated coins. *
Two observers can't send information to each other because neither
knows what will come up in a coin flip if the outcome is modeled
quantum mechanically, that is irreducibly random , but each element of
a pair of entangled particles can send information to its partner,
since if it couldn't, they wouldn't be entangled. AG
First of all you need to realize that "entangled particles" is just
shorthand. Particles aren't entangled. Some property of the particles
is entangled, e.g. spin or momentum or position. So in Hilbert space,
instead of there being two different vector components for the spin of A
and the spin of B, there is only one vector for the spin of both A and
B. So Alice can measure it and B can measure it. But neither can
change or control the measurement. It's random.
Brent
*
*
***John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
tne
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