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[Science] Physicists Create First Long-Distance Quantum Link - Page 3

post #21 of 47
Quote:
Originally Posted by dagnisaun View Post

how does this work if the quantum state needs to be measured at the sender AND receiver?

If I remember correctly, they send from the same point two particles entangled, they know the speed, thus they also know when they will "hit" or pass through a filter or anything that actually let you alter their state and they pass through a "reader" or whatever it is that indicate your what the state is. Every time the particles had the same state.
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post #22 of 47
"Scotty! Beam him down!"
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post #23 of 47
I'm sorry for the rage, but oh my god, this is NOT quantum entanglement over long distances--it's not even quantum entanglement in the way it's understood by most physicists! The person that wrote this article needs to re-evaluate their use of quantum entanglement.
Quote:
Ritter's team caused a photon emitted by that atom to escape from its cavity and travel through a 60-meter-long optical fiber to the cavity across the street. When the photon was absorbed by atom B, the original quantum information from the first atom was transferred to the second.

That is NOT quantum entanglement. It's a state change requiring physical interaction between the two particles! Quantum-entanglement is a through-space interaction with no direct physical interactions/stimulations. All they did was prove that a photon of energy E emitted by particle A was the same energy required to put particle B into the same state as particle A, and you could accomplish that using a fiber optic cable. Guess what? All you did was verify photophysics. People who use lasers do that every day.

This is not quantum entanglement, it's physical entanglement between two locations. It does not at all involve the theory of quantum entanglement as it's understood and discussed by pretty much anyone who even remotely understand what it is. This isn't even a quantum link, it's a physical link. Take away the direct physical connection between the two particles and you would have nothing. Bupkis. There is so much fail in the linked article (not talking about the actual journal article in Nature). :/
    
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post #24 of 47
Quote:
Originally Posted by guyladouche View Post

I'm sorry for the rage, but oh my god, this is NOT quantum entanglement over long distances--it's not even quantum entanglement in the way it's understood by most physicists! The person that wrote this article needs to re-evaluate their use of quantum entanglement.
That is NOT quantum entanglement. It's a state change requiring physical interaction between the two particles! Quantum-entanglement is a through-space interaction with no direct physical interactions/stimulations. All they did was prove that a photon of energy E emitted by particle A was the same energy required to put particle B into the same state as particle A, and you could accomplish that using a fiber optic cable. Guess what? All you did was verify photophysics. People who use lasers do that every day.
This is not quantum entanglement, it's physical entanglement between two locations. It does not at all involve the theory of quantum entanglement as it's understood and discussed by pretty much anyone who even remotely understand what it is. This isn't even a quantum link, it's a physical link. Take away the direct physical connection between the two particles and you would have nothing. Bupkis. There is so much fail in the linked article (not talking about the actual journal article in Nature). :/

Fooled by title biggrin.gif

"Physicists Create First Long-Distance Quantum Link"
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post #25 of 47
how can information teleport faster than light when no particle can do that.
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post #26 of 47
Quote:
Originally Posted by Just a nickname View Post

Fooled by title biggrin.gif
"Physicists Create First Long-Distance Quantum Link"

I got the title, but read through the article. They talk about quantum entanglement. But this is not it. Here's their fail:
Quote:
Bizarrely, an atom can also be in two different energy states—call them 0 and 1—at once, although that uncertain two-states-at-once condition "collapses" into one state or the other as soon as the atom is measured.

This is not what's happening. All they're doing is changing the state of the atom and measuring it. Measuring molecule A has no effect on the state of molecule B. And if molecule A's state changes mid-measurement, that change is not reflected when measuring molecule B. :/
    
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post #27 of 47
Quote:
Originally Posted by guyladouche View Post

I got the title, but read through the article. They talk about quantum entanglement. But this is not it. Here's their fail:
This is not what's happening. All they're doing is changing the state of the atom and measuring it. Measuring molecule A has no effect on the state of molecule B. And if molecule A's state changes mid-measurement, that change is not reflected when measuring molecule B. :/

Correct. However, they're discussing this as using it as a form of encryption.

Example: Particle A and particle B are entangled. You decide to create a document. Then, you encrypt that document using Particle A's entanglement pattern. Then, the document is transmitted via fiber optics or other physical means to a receiver that contains Particle B. During transit, the data is completely scrambled, but upon arriving at Particle B's location, the data is rebuilt and decoded using the same entanglement pattern. The same entanglement pattern can also be created with other particles (C, D, E, etc.) to create an unhackable network. The idea is incredibly brilliant.

This isn't entanglement in the truest sense, but it's a damn fine use of our existing knowledge about it. It's also a huge step forward compared to just "observing particles" like we've been doing for who knows how long now.
Edited by Mad Pistol - 4/11/12 at 8:21pm
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post #28 of 47
Quote:
Originally Posted by Mad Pistol View Post

Correct. However, they're discussing this as using it as a form of encryption.
Example: Particle A and particle B are entangled. You decide to create a document. Then, you encrypt that document using Particle A's entanglement pattern. Then, the document is transmitted to a receiver that contains Particle B. During transit, the data is completely scrambled, but upon arriving at Particle B's location, the data is rebuilt and decoded using the same entanglement pattern. The same entanglement pattern can also be created with other particles (C, D, E, etc.) to create an unhackable network. The idea is incredibly brilliant.
This isn't entanglement in the truest sense, but it's a damn fine use of our existing knowledge about it. It's also a huge step forward compared to just "observing particles" like we've been doing for who knows how long now.

It's not entanglement at all. It's no different than an electronic signal being a 1 or a 0. You have to first cause the excited state of A, let it relax, then send that emitted photon through a light pipe to B, then let B change state, and then measure B. But here's the question: Why do you even know to measure B at all? Because you think you've changed its state. But how do you know the state is what it is supposed to be without measuring A and sending that info along through some other means? It's a worthless experiment in terms of practicality. This is not encryption, it's transferring information through a physical link, which we already do with bits and bytes. But the problem still comes down to how do you know what the state of particle A was and what state it's supposed to be? If this were truly entanglement, you wouldn't have to worry about that since their states immediately interact without a physical link. But since you first have to cause the state change of A, let it affect B through a physical link, and then measure B, you still need a secondary conduit to tell you what the state of A is really supposed to be in the first place (to verify that B is what it's supposed to be--kinda like a hash key). It's a remarkably mundane experiment and has nothing to do with quantum entanglement.
    
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post #29 of 47
So mundane that you can reproduce the experiment in your basement, right? rolleyes.gif

I don't think mundane is the right word here. It is a step forward though. Look at the big picture; electricity started out with experiments dealing with naturally occurring static electricity. Now our lives are controlled by electrons flowing through just about everything that we touch.

These scientists have done something that hadn't been done before. Give them credit where credit is due. thumb.gif
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post #30 of 47
So Quantum Communication is a WIP... how long before we discover mass effect relays? tongue.gif
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