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Tuning up for Teleportation

Posted February 12, 2009 9:39 AM

From physicsworld.com: headline news:

A new technique for controlling the speed of "teleportation" in quantum systems has been created by physicists in the US and UK. The team has demonstrated a way of "tuning" beams of light to distribute quantum information to specific points in space and time. Manipulating and storing data in this way is an important step towards new communication devices and eventually a quantum computer, say the researchers. In quantum teleportation, the sender (Alice) instantaneously transfers the quantum state of a particle to a receiver (Bob). In 1997 physicists captured public attention by teleporting quantum states between "entangled" photons for the first time. Entanglement is a feature of quantum mechanics that allows particles with two distinct quantum states to share a much closer relationship than classical physics allows. Over the intervening 12 years teleportation has been demonstrated over increasing distances and between larger particles.

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Anonymous Poster
#1

Re: Tuning up for Teleportation

02/12/2009 10:14 AM

Once again, I have to question the use of the word "instantaneously".

I thought the jury was still out on whether the effect of entanglement is limited to the speed of light. In fact, I could have sworn that the last time I walked past the jury deliberation room I overheard several voices saying "Yes it is".

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#2
In reply to #1

Re: Tuning up for Teleportation

02/12/2009 1:20 PM

See my previous posts on CR4 regarding quantum state teleportation. There appears to be a loophole when working at the quantum level that does indeed allow instantaneous transmission (due to a particle being able to have two different states simultaneously, hence you don't have a particle movement such as a flow of electrons (ie- classic current flow theory) which IS limited by the speed of light and the laws of classical physics). It may take another 6 years before a viable data transmission product can actually be produced outside of a lab thou.

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Anonymous Poster
#3
In reply to #2

Re: Tuning up for Teleportation

02/12/2009 3:48 PM

Thanks for the info. I'll try to read your previous posts later.

Although from a light skimming on the net, I've seen an argument that quantum communication is indeed instantaneous but it doesn't violate general relativity because it still requires a classical information channel on each end.

This utterly befuddles my tiny mind. Am I to understand that simply because I and my companion 20,000 light years away both utilize non-quantum means (for lack of a better term) to physically encode and decode information into / out our respective quantum-paired particles, that the instaneous skipping-over of the 20,000 years between us doesn't violate GR?

If true, I'm fine with that - I guess. Although my overactive imagination wants to think that by way of balance it should somehow take 20,000 years for the information to pass from my particle to me.

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Anonymous Poster
#4

Re: Tuning up for Teleportation

02/13/2009 8:29 PM

Beam me up Scotty !

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