Slashdot Mirror

← Back to Stories (view on slashdot.org)

Open-Destination Quantum Teleportation

Posted by timothy on from the got-one-in-my-basement dept.

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."

6 of 487 comments (clear)

  1. oh please by OwlofCreamCheese · · Score: 4, Insightful

    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...

    --
    -You're wasting your time. Alfador only likes me.
    1. Re:oh please by tylersoze · · Score: 4, Insightful

      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.

  2. Re:In other news.. by mabinogi · · Score: 3, Insightful

    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?

    --
    Advanced users are users too!
  3. This might be dangerous by Tablizer · · Score: 3, Insightful

    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 :-)

    --
    Table-ized A.I.
    1. Re:This might be dangerous by Crystalmonkey · · Score: 3, Insightful

      The chances couldn't get any lower...

  4. But they are entangled! by mewphobia · · Score: 3, Insightful

    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?