Well with all the tech news here in GD today I thought I would post this:
Quantum Teleportation Achieved Across 10 Miles
This is far more interesting to me than reprogramming a few cells.
Well with all the tech news here in GD today I thought I would post this:
Quantum Teleportation Achieved Across 10 Miles
This is far more interesting to me than reprogramming a few cells.
I read that as meaning that the teleportation is instantaneous (ie, not at the speed of light) like gravity is instantaneous (if the sun disappeared, we would be immediately released from orbit, but not see the disappearance for eight minutes).
Anyone know if I got that right?
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
Originally Posted by brewbuck:
Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
He's prob too busy playing pac-man while trying to post.
Hope he chokes on that damn thing
Originally Posted by brewbuck:
Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
But somehow the phenomenon of entanglement is excluded from this, if we can describe it as "information". That also means that the earth would be released at the same time as we see the sun disappear, since gravitons are supposed to travel at the speed of light.Nothing can travel faster than the speed of light. That includes information.
We have to ask ourselves if teleportation is the instant movement of objects or the movement of their properties. From a physical POV, both are yet equivalent since there is no way to distinguish two particles with the same properties. But I don't believe this applies to conscious beings (not sure about that, anyone discovered it exactly?)
No, but the "entangled particles" bit implies a pre-existing relationship, as with a gravitational "field". As I said -- the effect of gravity is not bound by the speed of light.* Otherwise this would be silly, they are just transmitting.
* does that count as information?
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
If we start excluding things from special relativity on a whim, we might as well exclude special relativity.
Entanglement does not get excluded. It simply is an extension to quantum state. Check the wikipedia article. In this case, essentially you can't describe one photon without observing both. But these are photons we are talking about. So... you know the drill by now. i.e. Speed of Light.
Originally Posted by brewbuck:
Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
If gravitation is in fact transmitted by special particles (gravitons), this is wrong. Gravitation may seem instant, but it probably isn't. It's just that it's so weak nobody noticed when the gravitational field of a faraway object disappeared, so that can't be easily measured.as with a gravitational "field"
I think Heisenbergs Uncertainty Principle should be extended to cover quantum physics itself... why can't the world be just a bit more simple. And still work as we know it.
I understand your little mantra, but you are conceptualizing incorrectly. Again, gravity. The reason the effect of gravity is "instantaneous" is that it is already here. But again, if a sufficient mass were to disappear (which is not possible according to the laws of physics, so your information is still bound), it would not be here. Instantly.
Hmm, but the change takes place at the same time -- it does not travel from one photon to the other.In this case, essentially you can't describe one photon without observing both. But these are photons we are talking about. So... you know the drill by now. i.e. Speed of Light.
Okay, I had not heard of this one. So gravity remains a mystery and this is an untestable hypothesis (the instantaneousness), what about the entangled particles? Is information transmitted via some connection, or not? I think that possibility is the only thing I find intriguing here...
Last edited by MK27; 05-21-2010 at 01:11 PM.
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
We know very little about gravity. It's unfair for you to quote what is essentially still very early work.
At which speed do you expect your photon to travel? I suggest you read the source article: Quantum teleportation achieved over ten miles of free space. These photons are traveling.Hmm, but the change takes place at the same time -- it does not travel from one photon to the other.
Originally Posted by brewbuck:
Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
Does this mean there is the equivalent of red/blue shift in observing galactic motion (ie, they are revolving around a center that is now very far away)? I imagine that is hard to ascertain due to the influence of dark matter. Also I guess we would be observing them in the past.
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
Yes, but the "teleportation" is not synonymous with the travelling:
This still implies to me that the "response" of the second particle is not delayed, since they refer to no means of transmission ("communicating information without needing a traditional signal") etc. Kind of irritating the writer wouldn't consider that worth clarifying.In this particular experiment, researchers maximally entangled two photons using both spatial and polarization modes and sent the one with higher energy through a ten-mile-long free space channel. They found that the distant photon was still able to respond to changes in state of the photon they held onto even at this unprecedented distance.
Since they were discussing doing this from the earth to the moon, if that were the case it would be observable. You could make a request from the moon via normal means, at a 1 second delay, and if the response then triggered on Earth involved a reply using entangled particles, you would not have to wait another second for that reply. You would receive it at the same time as your request was received on Earth (or with whatever microsecond delay was required to trigger on reception of the request).
Of course, if this were the case, probably a bigger deal would be being made because you're right Mario, normally information is presented as bound by the speed of light. There's some details missing here, or I guess we'll be hearing that it can in the future.
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
Ugh. Sorry I linked you to the wrong article. Check the link on that article "As we explained before".
Here's a meaningful quote:
It's not clear how this second experiment was performed. But it should have been similar to that. Note particularly the "entanglement" method. This is no quantum entanglement.This particular experiment involved using a magnetic field and a laser to put a trillion cesium atoms into a particular quantum state. These atoms are then entangled with a light pulse. Thus, the receiver is using a group of atoms as an entangled particle while the sender is using photons as the entangled particle. The object to be teleported is the quantum state of a second light beam. The measurement consists of combining the two beams at a partially reflective mirror and measuring their combined intensity with a light detector. The result of this measurement is then used to drive a radio frequency magnetic field to manipulate the quantum state of the cesium atoms. This replicates the polarization state of the second light field onto the spin state of the cesium atoms. At this point teleportation has occurred.
The limitations both in transmitting or receiving information are very real to us. We may have achieved some sort of teleportation, but I can't see how we could ever do that with a technology we still don't have; That which would allows us to transfer information instantaneously. Neither this method suggests we did.
In short... teleportation of information? Apparently yes. But still limited to the speed of the "materials" in our current technology.
Originally Posted by brewbuck:
Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.
Yeah, in fact they need to set up communication just to accomplish the teleportation:
So it would be pointless as means of communicating information. And, as was initially explained, the "teleported" thing is not the original, it's a copy, so in that sense there is no distance involved (and no speed limit to exceed).First you must create a pair of particles that are in an entangled state. These particles are then shared between the receiver and the sender. The sender takes the object to be teleported and the entangled particle and performs a joint measurement on them. The sender then tells the receiver the result of that measurement, who uses that information to perform a local operation on the entangled particle. These operations cause the object's quantum state to be transfered from the object to the receiver's entangled particle. Hence teleportation is achieved.
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge