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

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

[dont_think_twice]

For the record, everything the parent said is COMPLETELY WRONG. I am not sure if he is a troll or an idiot, but either way, that comment is NOT infomative.

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

[stonecypher]

So sorry.

For this: this effect does not supply long distance communication. All it does is supply uncrackable encryption.

BZZT. One, entanglement most certainly does provide long distance communication. The term is "ansible," and the idea is that entangled particles which share properties over any distance instantaneously can share information by encoding within those properties.

As far as unbreakable encryption, horseshit. QC doesn't change the nature of encryption in any way, though it takes a really scary look at cryptanalysis, and my Visa card. What you're mistakenly thinking of is the principle that you cannot secretly snoop a quantuum line, because the contents change on inspection. That doesn't mean that you can't intercept the data stream, or that the data stream is somehow intangible. It just means that the other end will know, no matter what, unless you cut the line, insert a reader and a new writer (which can make the exchange at close enough to line speed that the other end won't notice, which given fiber optics is ... unlikely.)

Thanks for playing; we've got some great consolation prizes for you.