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Scientists now closer to being reliably able to 'teleport' information
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Reaver Glitterstim
The Scope
Gallente Federation
#21 - 2014-06-01 01:29:45 UTC
Actually fields have impacts much faster. If I wave my hand around, I tow the entire Andromeda galaxy with it instantly. There is no travel time because my hands are already touching it as we speak.

FT Diomedes: "Reaver, sometimes I wonder what you are thinking when you sit down to post."

Frostys Virpio: "We have to give it to him that he does put more effort than the vast majority in his idea but damn does it sometime come out of nowhere."
James Amril-Kesh
Viziam
Amarr Empire
#22 - 2014-06-01 05:26:45 UTC
Esna Pitoojee wrote:
Article

So, apparently they've got the success rate way, way up with this kind of thing, although the process involves electrons "trapped in diamonds at extremely low temperature". Still, one step closer...

RELEVANT EVE LORE FACTOID: Quantum entanglement, used in this 'teleportation', is the way our "fluid router" communications function in EVE lore. This is why - in addition to being instantaneous despite vast stellar distances - it is virtually impossible to 'jam' our communications: The entanglement effectively functions 'around' rather than 'through' the space between two points; any noise between those two points is irrelevant so long as the entangled link holds up.

Quantum teleportation has NOTHING to do with teleportation in any sense that we think about it, and will never lead to any kind of instantaneous or faster-than-light communications platform. That's a physical impossibility. You cannot use quantum entanglement or quantum teleportation to transmit classical information.

Enjoying the rain today? ;)
Reaver Glitterstim
The Scope
Gallente Federation
#23 - 2014-06-01 05:36:55 UTC
James Amril-Kesh wrote:
You cannot use quantum entanglement or quantum teleportation to transmit classical information.
It's kind of difficult to verify that something can't be done simply by not having found a way yet; even more difficult when a way has been found.

We already know that in some ways, things are much closer than they appear. I don't see why we should assume this property cannot be exploited in any way to transmit information across our 3D plane faster than light travels through it.

FT Diomedes: "Reaver, sometimes I wonder what you are thinking when you sit down to post."

Frostys Virpio: "We have to give it to him that he does put more effort than the vast majority in his idea but damn does it sometime come out of nowhere."
James Amril-Kesh
Viziam
Amarr Empire
#24 - 2014-06-01 05:45:25 UTC
Reaver Glitterstim wrote:
James Amril-Kesh wrote:
You cannot use quantum entanglement or quantum teleportation to transmit classical information.
It's kind of difficult to verify that something can't be done simply by not having found a way yet; even more difficult when a way has been found.

We already know that in some ways, things are much closer than they appear. I don't see why we should assume this property cannot be exploited in any way to transmit information across our 3D plane faster than light travels through it.

http://en.wikipedia.org/wiki/No-communication_theorem

In layman's terms (I'm posting an explanation given by user methinks2015 on reddit):
Quote:
Think of it this way: suppose you have two coins, one set to heads and the other to tails. You randomly place them into the two bags, give one bag to Arlene (who stays on Earth) and the other one to Brett (who flies off to another galaxy). Note that Arlene and Brett don't know from the outset what kind of coin they have.

Each one can flip their coin from heads to tails (and vice versa) at will, and it will instantly flip the other coin -- the coins are entangled. BUT, they can only do that as long as NEITHER of them open their bags or look at their coins. As soon as one of them looks at his/her coin, the whole system breaks down and they cannot manipulate the other coin remotely any more. This means that they cannot peek at their coin before they flip it.

So Arlene has a bag with an undetermined coin and wants to send Brett a message. She flips the coin (without looking at it), Brett then looks at his coin (collapsing the system), and.... it tells Brett exactly nothing because he didn't know whether his coin was heads or tails in the first place. And if he would have checked, then Arlene would not have been able to flip Brett's coin.

In fact, if Arlene wants to pass any information to Brett via entangled coins, she has to (1) either flip or not flip her coin, and (2) either tell Brett whether she flipped the coin or not, or else tell Brett what her coin came out to be.

Note that step (2) always has to occur via normal wires as a normal ("classical", as opposed to "quantum") message. Which sucks, because it can't happen faster than light.

So entanglement is cool, but can't be used to transmit information faster than light.

Enjoying the rain today? ;)
Riyria Twinpeaks
Perkone
Caldari State
#25 - 2014-06-01 05:50:33 UTC  |  Edited by: Riyria Twinpeaks
Reaver Glitterstim wrote:
Actually fields have impacts much faster. If I wave my hand around, I tow the entire Andromeda galaxy with it instantly. There is no travel time because my hands are already touching it as we speak.


I found this on the topic:
http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html

from the conclusion part of above link wrote:

If the calculational framework of general relativity is accepted, the damping can be used to calculate the speed, and the actual measurement confirms that the speed of gravity is equal to the speed of light to within 1%


Bottom line: we haven't been able to measure it directly, but all the hints seem to point to a finite speed for gravitational interaction.
(And for electromagnetic interaction we already measured this directly, as changes in electromagnetic fields propagate as electromagnetic waves .. light)
James Amril-Kesh
Viziam
Amarr Empire
#26 - 2014-06-01 05:52:26 UTC
That's NOT to say that quantum teleportation is useless or has no application. That's also demonstrably untrue. Quantum teleportation does have significant applications in the field of computer science, both in the construction of quantum computers, and more interestingly in the field of secure communications and cryptography. It would lead to, for example, a communications system that cannot possibly be tapped by a third party.

Enjoying the rain today? ;)
James Amril-Kesh
Viziam
Amarr Empire
#27 - 2014-06-01 05:55:16 UTC
Riyria Twinpeaks wrote:
Reaver Glitterstim wrote:
Actually fields have impacts much faster. If I wave my hand around, I tow the entire Andromeda galaxy with it instantly. There is no travel time because my hands are already touching it as we speak.


I found this on the topic:
http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html

from the conclusion part of above link wrote:

If the calculational framework of general relativity is accepted, the damping can be used to calculate the speed, and the actual measurement confirms that the speed of gravity is equal to the speed of light to within 1%


Bottom line: we haven't been able to measure it directly, but all the hints seem to point to a finite speed for gravitational interaction.
(And for electromagnetic interaction we already measured this directly, as changes in electromagnetic fields propagate as electromagnetic waves .. light)

If gravity DIDN'T have a finite speed then it would have some pretty serious implications for science. It would completely shatter what we know about relativity. And it would allow for violations of causality, etc.

Of course one of the problems is that a finite speed of light necessitates the existence of gravitational waves. Indirect evidence for gravitational waves has been found, but because gravity is so incredibly weak (it's the weakest of the fundamental interactions, which is why quantum mechanics fails to account for it at all) we haven't yet been able to detect them directly.

Enjoying the rain today? ;)
Riyria Twinpeaks
Perkone
Caldari State
#28 - 2014-06-01 05:58:53 UTC  |  Edited by: Riyria Twinpeaks
James Amril-Kesh wrote:

[interesting stuff about transmitting information faster than the speed of light and why it shouldn't work]


That's how I had understood it so far as well. But if they have found a way, then it's possible I guess.
I'd just like to understand ^-^

Edit: I haven't read the paper the article in the OP talks about, but maybe it's just about quantum teleportation for computing and secure communication, as James said above, not about transmitting information instantaneously?
James Amril-Kesh
Viziam
Amarr Empire
#29 - 2014-06-01 06:09:16 UTC  |  Edited by: James Amril-Kesh
It is transmitting information instantaneously. It's just that the type of information is quantum information. You can't use it in the same sense as you can use classical information.

In order to make use of quantum teleportation for communications purposes it needs to be supplemented with classical information, which has the speed-of-light hard limit. Quantum information on its own can't be magically turned into classical information that we can interpret in any meaningful sense (this is the no-teleportation theorem).

Enjoying the rain today? ;)
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