I read that as the Univesity of Woolloomooloo
and couldn't understand why the experiment didn't involve Bruce and Sheila.
University of Waterloo boffins have demonstrated a three-way quantum entanglement that shows quantum non-locality can work with more than two particles.* The regulars of quantum physics, Bob and Alice, and the interloper Charlie, had an appropriately trailer-trash setting, but alas saw precious little one-on-one photon action …
and couldn't understand why the experiment didn't involve Bruce and Sheila.
No, it's the University of Waterloo ....
famous for the toilet-wall graffito "this is where Napoleon pulled his bone apart".
Bruce and Sheila?
Crikey, you're beginning to show your age.
BTW, I once briefly lived in that 8-Os 'establishment', the pie and peas were good (locals will understand the connection).
Nonlocality describes the ability of particles to instantaneously know about each other’s state, even when separated by large distances. In the quantum world, this means it might be possible to transfer information instantaneously – faster than the speed of light. This contravenes what Einstein called the "principle of local action," the rule that distant objects cannot have direct influence on one another, and that an object is directly influenced only by its immediate surroundings. …. https://uwaterloo.ca/news/news/experiment-opens-door-multi-party-quantum-communication
In quantum communications worlds, where secret intelligence and sensitive information transfers take place, there is no question nor doubt that faster than the speed of light virtually instantaneous thought transfer, is possible, and is in every case, the default mechanism and nothing at all exceptional and particular or peculiar.
Such then renders what Einstein called the "principle of local action," the rule that distant objects cannot have direct influence on one another, and that an object is directly influenced only by its immediate surroundings, null and void/fundamentally incorrect.
One does wonder when one has a ponder what else Einstein’s thought transfers got so fundamentally wrong, for it is not as if he was able to share them with any sizeable and more knowledgeable peer group for systemic error correction in his day, whereas nowadays with ICT can one practically instantly share anything and everything with everyone and anyone internetworking in Global Information Grids with Global Operating Devices on SMARTR IntelAIgent Systems which present the future with Media Command for to Control Live Operational Virtual Environments ……. aka Realities.
Energy via Media Command and Control Squared‽ :-)
"In quantum communications worlds .. there is no question nor doubt that faster than the speed of light virtually instantaneous thought transfer, is possible"
Could you give us a practical demonstration of instantaneous thought transference?
... when I find amanfromMars easier to understand than the article he comments on.
...somehow got me thinking of Tom Lehrer's "I got it from Agnes":
"I love my friends and they love me
We're just as close as we can be
And just because we really care
Whatever we get, we share!
I got it from Agnes
She got it from Jim
University of Waterloo boffins have demonstrated a three-way quantum entanglement transferring information faster than the speed of light.
While admittedly most of quantum theory flies way above my head, I was under the impression that entanglement still does not allow FTL information transfer. If that's not so, I'd really like to see it confirmed somewhere reputable, since the only place I know to look - Wikipedia - apparently still begs to differ (http://en.wikipedia.org/wiki/Faster-than-light#Quantum_mechanics).
The correlation that occurs with entanglement is instantaneous and does not depend on temporal or spatial separation, but that isn't quite the same as information transfer. Any data transmission is still limited by the velocity of light.
At least that was the case the last time I could understand it.
No, there is not "information transfer" faster than the speed of light. The effect here seems to be non-local, but we've known for a long time that QM is almost certainly non-local*.
In order to transfer information you first have to entangle the particles, then separate them (slower than light), then do your experiment, then bring the results back together to compare them (slower than light).
The subtlety that many people miss, including the Uni of Waterloo's PR department, is that the entanglement results appear completely random when considered separately, and there is no information /until you bring both sets of results together/ and measure the correlation between them. This last step is still slower than the speed of light.
So no, this doesn't undermine Einstein. If anything, it underlines how brilliant he was to deduce such a basic principle of the universe even before QM was understood as it is today.
*There's still a slim hope that locality can be rescued -- even Bell's Theorem doesn't completely rule it out -- but it does require other sacrifices in our understanding of reality that are probably even worse.
I always thought that after entanglement, 2 particles could be seperated (at < c ), and then any change in one particle is instantaneusly happening also in the other particle. But information isn't being transmitted between the 2 (at least not at any speed > c ).
I saw it the same way as synchronising 2 clocks and taking them to different places. The hands on both clocks are instantaneously mirroring one another but no information is being transferred between the 2.
I'm not sure exactly what I'm not understanding here but it seems like I've got some fundamentals wrong
...before QM was understood as it is today
Perhaps Feynman would call that an oxymoron. One struggles with squiggles on a page, Ψ, H etc., and with a bit of dexterity one may learn to manipulate them. 'Understanding' is perhaps another matter. ;-)
...but it does require other sacrifices in our understanding of reality.
Re Bell, what specifically?
@ James Micallef - Re :- "I saw it the same way as synchronising 2 clocks and taking them to different places. The hands on both clocks are instantaneously mirroring one another but no information is being transferred between the 2."
Didn't Mr E also have something to say about clock hands when the clocks were taken to different places?
the moment of entanglement is the branch point - one for each quantum outcome. the randomly selected experiment determines which branch is observed. the entangled entities don't need to communicate with each other.
What this and other older experiments demonstrate is that QM is inherently non-local. Incredibly QM manages to be non-local yet prevents information transfer using the non-local nature. This is amazing when you think about it.
The non-locality also means it is not necessarily true that QM is inherently random, non-local hidden variables could be present and depending on your personal bias this may seem more or less likely than th3 traditional view.
I can guess the answer to this, but this subject is simultaneously fascinating and way outside my area of expertise. Is it possible to know from one of a set of entangled objects if entanglement has been broken at the other end at the time it occurs? Is there a method for doing this other than comparing their respective states? If so, wouldn't the fact that entanglement had been broken constitute information being transferred?
"University of Waterloo boffins have demonstrated a three-way quantum entanglement transferring information faster than the speed of light."
Prediction: No they haven't.
So the following is wrong ?
Take Particles A and B
Move them apart
Change the "Spin" on particle A
Particle B "Spin" also changes at the same instant
Is this (admittedly super simplified) what happens with quantum entanglement ?