Towards quantum Internet: Researchers teleport particle of light six kilometres

originally posted by: slapjacks

According to The Libertarian Public, scientists at the University of Calgary succeeded in transporting a particle close to four miles away from its original location. While this may not mean we’ll be teleporting to different planets with the push of a button anytime soon, it does mean that the way we use technology could drastically change very soon. To better explain why this finding is such a major this, Dr. Wolfgang Tittel from the University of Calgary explained via a press statement:

“Being entangled means that the two photons that form an entangled pair have properties that are linked regardless of how far the two are separated. When one of the photons was sent over to City Hall, it remained entangled with the photon that stayed at the University of Calgary. What happened is the instantaneous and disembodied transfer of the photon’s quantum state onto the remaining photon of the entangled pair, which is the one that remained six kilometres away at the university.”

So apparently they were able to transport particle(s) nearly 4 miles away from it's original location. Mind blown right now.
At the rate technology is advancing, I can't wait to see where will be 50 years from (if I live that much longer)

City's accessible dark fibre makes research possible The research could not be possible without access to the proper technology. One of the critical pieces of infrastructure that support quantum networking is accessible dark fibre. Dark fibre, so named because of its composition—a single optical cable with no electronics or network equipment on the alignment—doesn't interfere with quantum technology. Read more at: phys.org...

What are your thoughts ATS? Which way do you see technology heading?

Source[/ur l]

[url=http://screenrant.com/star-trek-teleportation-science-particle/]source

So this is gonna make satillites irrelevant huh??

GPS, antennas, all that junk?!?!

originally posted by: JoshuaCox
Yea should have been that they " teleported information" not they teleported a proton.

I think you mean photon instead of proton but otherwise that is essentially correct, though it's a very limited form of somewhat random information being teleported

Imagaine space exploration with realtime video and controls?!?!

No, you can't have realtime control of the Mars rover because the information being teleported is random, plus the fact that in order to even set this up you have to send the entangled photons at the speed of light so they aren't traveling any faster than light. Once the photons arrive at the measurement point, the teleportation of "information" is instantaneous, but I think people forget about having to get the photons there in the first place, as well as the randomness of the information making it not useful for space exploration, etc.

The technology is based on a quirky property of subatomic particles called quantum entanglement, where pairs of particles are linked through unique properties or “states,” even when separated at great distance. Quantum teleportation transfers the state of a quantum particle from one to another, without moving the particle itself.
...
“If you implement it correctly, it’s unbreakable.” said Tittel. “We are the first to demonstrate quantum teleportation in a setting that reflects that (which is) required for a long distance link based on quantum repeaters.”

Source: CTV News, - Canadian researchers lead the way towards unhackable internet communication.

So they (Tittle's Team) are investigating teleporting (transferring) quantum states between repeaters. The entangled sates allow verification that the data is not corrupted or hacked. The team in the OP have made a 6 km quantum repeater. It is noted in the article that China has done this at 14.7 km (same source).

Last year (2015), a team Australia teleported a quantum state 1.3 km Source (AustraliaFinancialReview.au).

Like the announcement about the Chinese quantum satellites, this is all direct, line-of-sight, measurement and detection. Wolfgang Tittle's team is working at 1 °K to "transport states" as part of creating quantum repeaters for a future quantum network. So this will not be something widespread until that temperature variable can be overcome.

originally posted by: Arbitrageur

originally posted by: JoshuaCox
Yea should have been that they " teleported information" not they teleported a proton.

I think you mean photon instead of proton but otherwise that is essentially correct, though it's a very limited form of somewhat random information being teleported

Imagaine space exploration with realtime video and controls?!?!

No, you can't have realtime control of the Mars rover because the information being teleported is random, plus the fact that in order to even set this up you have to send the entangled photons at the speed of light so they aren't traveling any faster than light. Once the photons arrive at the measurement point, the teleportation of "information" is instantaneous, but I think people forget about having to get the photons there in the first place, as well as the randomness of the information making it not useful for space exploration, etc.

I thought essentially they could substitute 1s and 0s for "left and right spins" per say.

a reply to: Arbitrageur

So basically they sperated the 2 entangled "photons, protons?" By what seems a fair amount of distance and confirmed they were entangled still?

originally posted by: JoshuaCox
I thought essentially they could substitute 1s and 0s for "left and right spins" per say.

Referring to spin states as 1s and 0s is no problem. The problem is you have no control over whether you're sending a 1 or a 0, it's completely random. So lets say the information you want to send is 11110000, there's no way to send that. You can only send some random string of 1s and 0s, which on rare occasion would match that string entirely by chance but most of the time what you send won't match that, it's just random gibberish.

a reply to: Homeles

And why did they have to use fiber?


Damit Jim im an electrcian not a quantum mechanic.

a reply to: Arbitrageur

So you cant communicate through the entanglement?

Or just not 1's and 0's?

a reply to: JoshuaCox


You cannot predetermine the state of the particle(s).

You don't know the state until you check it. Not only that, checking the state messes it up.

a reply to: Homeles

They transferred the information describing the "entangled state" without having to shoot the photon off to the receiving area (i.e., no particle involved just the information describing the entangled state). And yeah, verified the data was not lost just received then transferred that "state" into a new photon with all the same properties of the one that stayed put.

It is like the first steps of fiber optics. They need to create repeaters as light tends to degrade over distance (depending on which color is used) so a light amplifier reads the signal and repeats a clean beam out the other end. They are trying to do this at the quantum level over longer and longer distances.

[ETA: The "black fiber" is to keep stray particles from messing up the transferred data.]

originally posted by: Homeles
a reply to: Arbitrageur

So you cant communicate through the entanglement?

Correct, as far as we know, see the "no-communication theorem" which is not any kind of law, but it has yet to be experimentally violated as far as I know.

Or just not 1's and 0's?

You can send 1s and 0s if you want to call them that, you just can't send them in any particular order which is what you'd need to do to communicate.

a reply to: TEOTWAWKIAIFF

So when they sent the entangled info another photon picked up on that state and became entangled?


If so, and they sent a piece of light you could have a rectangle"monitor, window or whatever" have some live audio phone calls so to speak?

a reply to: Arbitrageur

So they a piece of light. I say piece but a photon i guess?

Bleh that sounded like crud.

Sent a piece of light.

Isnt light kinda squirrelly in the way it acts, both as matter and energy?

Btw thanks to you both for the replies.
Like a kid.....are we there yet?.......are we there yet?

originally posted by: Arbitrageur

originally posted by: JoshuaCox
I thought essentially they could substitute 1s and 0s for "left and right spins" per say.

Referring to spin states as 1s and 0s is no problem. The problem is you have no control over whether you're sending a 1 or a 0, it's completely random. So lets say the information you want to send is 11110000, there's no way to send that. You can only send some random string of 1s and 0s, which on rare occasion would match that string entirely by chance but most of the time what you send won't match that, it's just random gibberish.

Well that's about usless lol....

Thought they could manipulate the photon.

originally posted by: JoshuaCox
Well that's about usless lol....

Thought they could manipulate the photon.

Entanglement or quantum teleportation of information is useless for faster than light communication, but it turns out to be very useful for quantum cyrptography. Using a quantum entanglement scheme is about the only way you can be sure whether or not someone might be eavesdropping on your digital communication, so not completely useless.

a reply to: JoshuaCox


Cant the 1 or 0 just be encoded as the change of state.Like Morse code. "It changes..it gaps etc?

originally posted by: anonentity
a reply to: JoshuaCox


Cant the 1 or 0 just be encoded as the change of state.Like Morse code. "It changes..it gaps etc?

Not faster than light. You can do it at light speed but you don't need entanglement for that.

Think about it, you're at the receiving end, and you're either getting a steady stream of photons, or photons in not a steady stream. If the former, you have no way of knowing what was sent at the other end faster than light. If the latter, the photons could be sent to you in a Morse code pattern, but they wouldn't arrive any faster than the speed of light.

a reply to: Arbitrageur


Ok then what about two entagled pairs, one sending the 1 and the other the 0?

a reply to: anonentity

The state of the particles cannot be selected.

a reply to: Phage


Thanks for that, interesting stuff.