Thursday, October 05, 2006

First Teleportation Between Light and Matter

Beaming people in Star Trek fashion is still in the realms of science fiction but physicists in Denmark have teleported information from light to matter bringing quantum communication and computing closer to reality....Read more here
Also more info here too

Before reading it go through the below links to make sense what you are reading..
Quantum teleportation does not transport energy or matter, nor does it allow communication of information at superluminal speed.This is about the next generation of technology that may someday replace optic fibre for long-distance communication links.
Quantum_teleportation [wikipedia.org]

Also watch this video

Quantum teleportation does not transport energy or matter, nor does it allow communication of information at superluminal speed.This is about the next generation of technology that may someday replace optic fibre for long-distance communication links.

Put simply you can record the quantum states of an atom/particle(or your entire body) and then send this information using a classical channel like radio. Once this information gets to your destination(eg Mars) the guys at that end can use that information to affect some particles over there, and because of Quantum Entanglement, those particles on Mars will instantly take on the recorded state. The particles at the start will then lose their state due to the no cloning therom.[wikipedia] So you can teleport, but you can't teleport at greater than the speed of light because you still have to send the data to the destination.

Note that it's not technically "Teleportation", you are just changing the states at the quantum level.


This process allows you to copy quantum information from one set of atoms to another without measuring it, and thereby destroying it.

It's still isn't anywhere near dematerializing the matter and poof`ing it across the room/planet. However, what is happening is the quantum information (in this case, the spin state) of the matter has been instantly transported. That is a essential step in building a quantum computer or cryptography network.

This is not 'traditional' teleportation -It works at the speed of light, there's nothing strange going on here, although it is related to what you might have heard referred to as 'spooky action at a distance' With quantum teleportation you aren't teleporting a THING, you're teleporting a property of that thing without actually measuring that property. Sounds crazy but here's an example: suppose you have two helium atoms and using light you are somehow able to give the second atom the momentum and spin of the first atom but in the process you change the momentum/spin of the first atom. You've basically changed the second atom to be exactly like the first but they call that teleportation. And effectively it is. The reason its so nifty is you don't have to measure or know these properties to transfer them. Thats the quantum part of quantum teleportation. Beyond that, I have no clue how they're applying a property of light to an atom.

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