Open-Destination Quantum Teleportation

Roland Piquepaille writes "An international team of physicists has entangled five photons for the first time in the world, reports Technology Research News in "Five photons linked." Why is this important? Because it's the minimum number of qubits needed for universal error correction in quantum computing. In other words, they found a way to check computational errors in future quantum computers. The physicists also demonstrated what they call 'open-destination teleportation,' a way to teleport quantum information within and between computers." "They teleported the unknown quantum state of a single photon onto a superposition of three photons. They were then able to read out this teleported state at any one of the three photons by performing a measurement on the other two photons," adds PhysicsWeb in "Entanglement breaks new record ". This will be used in about ten to twenty years to move information among quantum networks. You'll find more details and references in this overview."

Comments

oh please

[OwlofCreamCheese]

oh man... please stop... I dread reading the replys to this story... so so many people not understanding will come up. its not faster than light communication... I promise...

Re:oh please

[tylersoze]

Ugh, you're so right, here we go again. Individual photons, or any massless particle, travel at *exactly* the speed of light, no more, no less. When physicists speak of "slowing down" or "speeding up" light, they are referring to a type of *wave* velocity is which utterly different than the speed of the individual particles making up the wave, is *not* the speed at which information can be transmitted by the wave. There is also no way to transmit information faster than light with entanglement. In fact, in the transactional interpretation (just an "interpretation" mind you, it in no way predicts different effects than other interpreations) the information is transmitted exactly at c, but *back in time* with advanced waves. These are prime examples of complex, subtle subjects that are totally misunderstood by the lay person because of simplified analogies or terminology.

Misunderstanding...

[rpbailey1642]

As far as I'm aware, this does NOT mean anything about downloading files, or any crap like that. When it says moving data across a quantum network, they are referring to a Beowulf cluster of sorts, for data processing. Please correct me if I'm wrong, my quatum computational theory is a bit rusty.

Re:What this means

[damiam]

I didn't RTFA, but I'll just guess that it lays the groundwork for building a computer, sometime in the next century that will be able to completely emulate [read: upload] a human personality/consciousness into an environment where they think they are still alive.

You guessed wrong.

i'll believe in it when i see it

[harkabeeparolyn]

As with nanotechnology, I'll believe in quantum computing when they produce some real results, like say factoring RSA 2048. Hell, let's see them factor the number 339. If practical quantum computing is decades away, can't they at least show us something impractical, just to prove that quantum computing isn't just hand-waving bullshit?

Re:The Wiki-Tome

[sirsnork]

Yeah, just like those damn flying cars and cold fusion. As always don't count your chickens before they hatch

Re:This is what a normal person just read above.

[mlg9000]

It means...

One step closer to nearly unlimited bandwidth, faster then light transmission(instant), using no wires or electromagnetic medium.

It also means one step closer to computers powerful enough that we can, say for example, model the human body to test all possible drug combinations at the same time.

One step closer to the singularity...

Re:In other news..

[mabinogi]

You mean like - "reports Technology Research News in 'Five photons linked.'"
and "adds PhysicsWeb in 'Entanglement breaks new record '."

How much credit do you want them to give?

This might be dangerous

[Tablizer]

They didn't really know the dangers of nuclear power when they started messing with it. The first nuclear reactors were built right under campus stadiums. What if quantum computing messes with or pollutes something we don't know about yet? Maybe there is "probability pollution" or something.

Hell, it might be decreasing further the chances of nerds getting dates or something :-)

Re:This might be dangerous

[Crystalmonkey]

The chances couldn't get any lower...

Re:

[Bastian]

If you follow the link, you will discover that the poster made an exact copy of the first few paragraphs of the linked article. Come on, mods. People deserve mod points for their their own ideas, their own words, and even quoting someone else when it's a pertinent quote.

Nobody deserves reward for taking another person's intellectual product and presenting it as their own.

But they are entangled!

[mewphobia]

This is how i read it too - but one thing doesn't make sense to me.

If the particles are entangled, and it observe one of the observer ones, isn't that going to change all of them because they are still entangled?

or do you unentangle them before you observe them? Can you unentangle particles without changing their state?

Re:Clarify something to me

[sserendipity]

If someone stops one clock, the other clock will instantly stop in the opposite position, 9e.g if the first one stopped at 6 o'clock, the other one would stop at noon). No information is transferred since the measurement on the first clock is completely random.

What about the the information that someone stopped the other clock?