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Teleportation demonstrated?

GlennB

Loggerheaded, earth-vexing fustilarian
GlennB
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Er, according to The Guardian it has been. Article

Looks like ignorant hype to me, and I'd say a respectable newspaper should know better.
 
Quantum teleportation has been a thing for a while now.

Are you questioning that quantum teleportation happens?

Or that it can lead to advances in quantum computing?


Which bit is it that you are sceptical of?
 
My understanding is that the 'teleportation' name is something of a misnomer, because 'information' is being moved, rather than actual matter.

(though what form does that information take? It's all getting a bit philosophical for me..)

That article certainly reads as if something is being physically moved, but my understanding has always been that 'quantum teleportation' is a form of communication rather than movement.
 
Given the no cloning theorem, I think that teleportation really is the right word for this.

Yes, it's certainly true that, as Worm says, nothing but information is teleported from point A to point B, but what is the state of a system other than information?
 
It is basically quantum entanglement. Imagine entangling 2 photons, so that they build one system and their combined wave function is an entangled wavefunction, and have one of those photo continue on its merry way. Then once a measurement is made either on the ground based photon or the space based wanderer photon, the whole system collapse (use another itnerpretation if you want but in absence of evidence of MW I will use copenhagen). Since it collapse, it collapse for both since they for a single entangled system. But you cannot get information from either, without knowing *both* state of both photon, which has to be transmitted at a local c speed maximum.

So yeah teleportation is a misnommer. But having an entangled photon captured on a 300 km away receptor through the atmosphere sound very incredible.
 
Roboramma said:
Given the no cloning theorem, I think that teleportation really is the right word for this.

Yes, it's certainly true that, as Worm says, nothing but information is teleported from point A to point B, but what is the state of a system other than information?
Click to expand...


So instead of "quantum teleportation", I should read "spooky action at a distance".
 
Roboramma said:
Given the no cloning theorem
Click to expand...

I really like that theorem. Mathematically, it's almost trivial. One of the simplest proofs that exists in physics. And yet, the implications are still quite deep and subtle.
 
Sending data via electromagnetic spectrum. So, radio has finally been invented.
 
Actually not even whole information is passed by quantum teleportation .. you must pass additional information by conventional means and compare these two together to get the original information.
 
From the article:

In quantum teleportation, a third particle is introduced and entangled with one of the original pair, in such a way that its distant partner assumes the exact state of the third particle.

For all intents and purposes, the distant particle takes on the identity of the new particle that its partner has interacted with.
Click to expand...

Yeah, the distant particle mimicking the state of the third particle is a long way from demonstrating teleportation.
 
3point14 said:
Is this what you think is actually going on here?
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Photons re electromagnetic wavicals aren't they?

Does that data transmission exceed the speed of light or something?
 
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casebro said:
Photons re electromagnetic wavicals aren't they?

Does that data transmission exceed the speed of light or something?
Click to expand...



"Although the name is inspired by the teleportation commonly used in fiction, there is no relationship outside the name, because quantum teleportation concerns only the transfer of information. Quantum teleportation is not a form of transport, but of communication; it provides a way of transporting a qubit from one location to another, without having to move a physical particle along with it."


https://en.wikipedia.org/wiki/Quantum_teleportation



From here. Have a read. I don't understand most of it. I'm prepared to believe those who have studied it who would, I'm fairly sure, tell you it's not radio communication - although, as above, it does involve classical communication.

But hey, I'm just some rube who also believes that a hydrogen atom has one proton, so what do I know.
 
casebro said:
Photons re electromagnetic wavicals aren't they?
Click to expand...
Quantum teleportation is possible, in theory, with any particles, even with massive objects. Photons were used in this demonstration because it's relatively easy to create pairs of entangled photons, and shipping one photon of the entangled pair to a distant location is faster and easier than shipping some other kind of particle would be.

casebro said:
Does that data transmission exceed the speed of light or something?
Click to expand...
No.

As Dr.Sid wrote:
Dr.Sid said:
Actually not even whole information is passed by quantum teleportation .. you must pass additional information by conventional means and compare these two together to get the original information.
Click to expand...
 
Lennart Hyland said:
So nothing like teleportation in syfy movies happened?
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And that is what the editors who compose the clickbait headline know*.

It would be like having the headline: "Flying cars are finally here." And then follow that with an article about how there are tiny flying car toys available.

*They know that people are going to instantly think Star Trek & "beam me up" and be much more likely to click on (and maybe even read) the story than if it was a truthful representation of the actual content of the story.
 
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