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Author Topic: Entanglement - spooky action at a distance  (Read 2966 times)

Offline Fluid_thinker

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Entanglement - spooky action at a distance
« on: 10/07/2008 11:17:14 »
This is a fascinating phenomena that has stopped and started many times

I know that in recent years that various experiments have been proven experimentally.

Has anyone started to think of any practical applications?


 

Offline Alan McDougall

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Entanglement - spooky action at a distance
« Reply #1 on: 10/07/2008 14:07:03 »
Well quantum computing for one and perhaps even insant information transfer across the vastness of the universe.

Regards

Alan
 

Offline JP

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Entanglement - spooky action at a distance
« Reply #2 on: 10/07/2008 15:01:51 »
Instant information transfer is probably not going to happen--there is a tiny bit of disagreement among scientists, but the general consensus is that you need to send classical signals on top of entanglement in order to send information, and classical signals are limited by the speed of light.

Another application is in quantum cryptography.  Since any observation changes quantum systems, you can use entanglement to help send an encryption key and to be able to detect if someone has listened in on what you sent.
 

Offline Fluid_thinker

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Entanglement - spooky action at a distance
« Reply #3 on: 10/07/2008 17:24:52 »
I agree cryptography is a natural progression based on the fact that it is impossible to retrospectively know the quantum state.

e.g. A * B does not equal B * A

Are there known faculties working on this?


 

Offline DoctorBeaver

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Entanglement - spooky action at a distance
« Reply #4 on: 10/07/2008 20:39:12 »
Fluid-thinker - welcome to TNS.

If by "faculties" you mean is it being researched at universties, then the answer is yes; Oslo, Calgary & Boston among them. Although I don't know for certain, I should be highly surprised if CalTech and MIT aren't having a little fiddle with it too.
 

Offline syhprum

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Entanglement - spooky action at a distance
« Reply #5 on: 11/07/2008 19:37:49 »
Do we need better cryptography?, there are already better ways to get secret information than by trying to crack codes with massive computers.
 

Offline JP

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Entanglement - spooky action at a distance
« Reply #6 on: 11/07/2008 21:34:33 »
It's not really better cryptography.  It's a way of ensuring that someone can't tap your line and get your encryption key.  Whether we need it or not is an argument that could be made, but that kind of security is beyond what can be provided by classical information transfer.
 

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Entanglement - spooky action at a distance
« Reply #6 on: 11/07/2008 21:34:33 »

 

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