To add comments or start new threads please go to the full version of: Researchers Demonstrate Quantum Teleportation
PhysForum Science, Physics and Technology Discussion Forums > News discussions > Physics News

Raphie Frank
I thought this was rather interesting...
---------------------------------------------

Researchers Demonstrate Quantum Teleportation and Memory in Tandem
By Laura Mgrdichian

In research that may be a key step toward real-life quantum communication—the transmission of information using atoms, photons, or other quantum objects—researchers created an experiment in which a quantum bit of information is transported across a distance of seven meters and briefly stored in memory. This is the first time that both quantum memory and teleportation, as the information transfer is known, have been demonstrated in a single experiment.

The experiment was performed by scientists from the University of Heidelberg in Germany, the University of Science and Technology of China, and the Atomic Institute of the Austrian Universities in Austria. The work was led by Prof. Jian-Wei Pan, a physicist at the University of Heidelberg.

A quantum bit, or qubit, is the most basic unit of quantum information. It takes the form of a particular configuration, or “state,” of an atom or photon. Unlike a traditional computer bit, the most basic piece of information a computer can store, qubits represent the superposition of “0” and “1,” rather than either a 0 or 1. Additonally, a qubit cannot be copied in the traditional sense. It can only be transferred, without leaving any trace of the original.

FULL ARTICLE: http://www.physorg.com/news120912180.html
(right here on Physorg.com)
Edward 3
The article on this forum from which you quote goes on to state that
" One qubit is able to assume the quantum state of another without physically interacting with it".
I have a real problem with defining this as teleportation - cloning maybe but definitely a long way from teleportation.
yor_on
I to have several problems with that interpretation.

First of all a " qubit represent the superposition of “0” and “1,” rather than either a 0 or 1 " and when the information is read it 'destroys' that 'superposition'.

the second one is that this is no 'teleportation' at least not in any material sense.
It's about 'information exchange' between 'entangled pairs.
Those have a relationship that is out of 'this world :)'.
Theirs are a instantaneous communication between two positions in spacetime.

The third one is that the information does not 'exist' without interference from a outside source. It's by observing/touching it, we will find out what 'state' the qubit resolved itself into.

A information transfer implies a transition between two points.
There are no such transition here.
What there is is a ?'simultaneously'? reading of a unknown state of a entangled pair where you 'break' the superposition into a 'event'.

I don't see how they can call a unforeseen 'breaking' of a superimposed qubit into a 'event' a teleportation?
PhysOrg scientific forums are totally dedicated to science, physics, and technology. Besides topical forums such as nanotechnology, quantum physics, silicon and III-V technology, applied physics, materials, space and others, you can also join our news and publications discussions. We also provide an off-topic forum category. If you need specific help on a scientific problem or have a question related to physics or technology, visit the PhysOrg Forums. Here you’ll find experts from various fields online every day.
To quit out of "lo-fi" mode and return to the regular forums, please click here.
©PhysOrg.com - physics and technology news - Version for PDAs