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

This is what a normal person just read above.

[Anonymous Coward]

Blah Blah Blah Blah,Blah,Blah, You have the bridge #1.

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

[Dorothy 86]

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.

you forgot that it is one step closer to being able to run Longhorn!

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

[john_smith_45678]

Thanks Commander Data.

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

[zangdesign]

One step closer to the singularity...

The day some idiot turns decision making over to computers is the day I start the Butlerian Jihad.

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

[krumms]

It's actually fairly simple. In QC, you can perform any quantum operations on the qubits, but you cannot look at the bits without losing some information. Therefore, what you do is use error correcting codes, by superimposing the quantum states onto a set of photons whose states you observe, but do not use. What they have done here is basically taken the unknown quantum state of a photon onto a superposition set of three photons, and you can find the state of any one photon by observing the other two photons.

Ah, much better. Thank you for putting it in layman's terms.

Now, if you'll excuse me I think I feel my head exploding ...

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

[elFarto the 2nd]

It can have any state, in between 0 & 1 -- just that you are not permitted to know what state it is in.

Kinda like a women then?

Regards
elFarto

Very obligatory Futurama

[Anonymous Coward]

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 photon

Professor: No fair! You changed the outcome by measuring it!

Re:oh please

[Klar]

This could lead to downloading mp3's before they have been recorded.. try to stop that RIAA bastards!

Already done?

[mozingod]

Open-Destination Teleportation...wasn't this already tested with success? Yea, I seem to remember a story about this. Something about all hell breaking lose and killing all the Marines/scientists that were working on the project though...

Finally...

[PDHoss]

...I empathize with Barbie. Math is hard.

Limited use?

[spellraiser]

From TFA:

In quantum teleportation, complete information about the quantum state of a particle is instantaneously transferred by the sender, who is usually called Alice, to a receiver called Bob.

So, this would only be useful for sending information about a quantum state to guys named Bob? The quantum state thing is limiting enough, but c'mon ... Bob?

Well, tell you what. I'm changing my name to Bob. If you can't beat them, join them. I mean, these guys will be the information uberlords of the future. People will queue up to them, asking 'Did anything come for me yet?' And they will go, like, 'Show me the money!'

The Bobs of the future will be ultra-popular and rich.

...

Yes, I haven't taken my medication today? Why do you ask? :P

Re:Limited use?

[Frogbert]

As a person who's name is Mallory I find this comment and your subsequent emails to your girlfriend offensive and arousing respectivily.

Future or syntax?

[sammyo]

"they found a way to check computational errors in future quantum computers."

Just how far in the future will we be able to check? Should be a great aid to debugging! But what happens if I fix a problem that causes my great grandson to come back in time to help me to meet my wife? Oh, wait.

Re:oh please

[britneys 9th husband]

This could lead to downloading mp3's before they have been recorded.. try to stop that RIAA bastards!

I'm going to download mp3s of all of next year's songs, copyright them myself, and release them into the public domain! Bwahaha! Take that, RIAA!

This is first

[JustOK]

Thanks to quantum computation and teleportation, this is actually the first post.

Re:This is first

[chazzf]

Yes, but the act of modding it up changed its location. Sorry about that...

I don't think three is enough...

[eRacer1]

On my systems three Q*berts is not sufficient for error correction in my simulations. Coily always gets me sooner rather than later.

Re:Quantum...

[karmatic]

In one hour? To quote from the article, "Quantum computers have the potential to be blazingly fast because a string of quantum bits, or qubits, that store the ones and zeros of computer information can represent all the numbers possible within that string at once."

In other words, in the time it takes you to transfer a single porn movie, you can simultaneously transmit _every_ porn movie of the same size or less.

Now that's a lot of porn.

The RIAA Wants Quantum Computing

[serutan]

Quantum teleportation is akin to faxing a document and in the process destroying the original.

[Scene: RIAA Headquarters]
Mitch Bainwol: "This quadrant teleportation thing sounds too good to be true."
Cary Sherman: "Get me Orrin Hatch on the phone. We need mandatory quantum teleplantation by 2010."

Quantum Humor

[ImaLamer]

However, according to Quantum Mechanics, the act of observing the particle changes the state of it.

Werner Heisenberg was pulled over...

Police Officer: Can you tell me how fast you were going?

Heisenberg: No, but I can tell you exactly where I am!