Forgot your password?
typodupeerror
Australia Science Hardware

Australian Researchers Devise Fault-Tolerant Quantum Computer 63

Posted by timothy
from the majority-rules dept.
schliz writes "Researchers have devised a theoretical quantum computer that could function even if one in four qubits were missing. The design is claimed to be the first that tolerates both qubit loss and decoherance to this extent. It performs calculations by measuring, rather than manipulating qubits, so there are fewer points of failure."
This discussion has been archived. No new comments can be posted.

Australian Researchers Devise Fault-Tolerant Quantum Computer

Comments Filter:
  • by girlintraining (1395911) on Sunday November 14, 2010 @07:20PM (#34226198)

    Oh sure, it's fault tolerant... until you look at it.

    • Yes, you can either precisely know the inputs, or precisely know the outputs, but never both...

    • My machines frequently burn out whenever I go to the toilet (by now, one notebook MB and two desktop PSUs). Does that mean that I have antiquantum computers?
    • by arth1 (260657)

      Yeah, I don't get the part where it's supposed to be more resilient because you measure instead of manipulate bits. In quantum mechanics, the two are the same, i.e. you don't "stress" the matter any less by observing than by manipulating.

    • by dragin33 (529413)
      lol
  • 3 bad Uncertainty Principle jokes already. I predict at least 50 more. Dupes count (obviously).

    • I predict at least 50 more.

      So you plan to change the number of bad jokes by reading the thread?

    • Q: Why didn't the good jokes about the uncertainty principle make it to the thread?
      A: They never left home -- "good jokes" and "uncertainty principle" don't commute.

      Secretly thinks the pun is kinda funny, but expects -1 Offtopics instead...
      • by furgle (1825812)
        The problem with uncertainty principle jokes: the funnier the joke the more uncertain you are of the actual composition, and if you do end up finding the composition of the joke you can't tell how funny it is. Furthermore, what the hell do you do with a dead cat?..
    • by Sulphur (1548251)

      3 bad Uncertainty Principle jokes already. I predict at least 50 more. Dupes count (obviously).

      Duplicats?

  • Announcer: "...Number 3, in a quantum finish!"
    Farnsworth: "No fair! You changed the outcome by measuring it!"
  • How about "quantum MITMs"?

  • Is this news? (Score:4, Interesting)

    by kasperd (592156) on Sunday November 14, 2010 @07:31PM (#34226280) Homepage Journal
    I recall hearing a talk about how to do fault tolerant quantum computing already six years ago. The main points I remember from the talk was that there was a theoretical limit to how much redundancy you could introduce as if you could reconstruct from half the qubits then you could clone the state, which is known to be impossible. I don't remember how large the gap was between the upper and lower bounds were, but they proved that at a certain error rate their redundant construction would improve the error rate, and could be applied multiple times to get even better error rates.
    • Re: (Score:1, Informative)

      by Anonymous Coward

      You're right that fault-tolerant quantum computers aren't new. The title of TFA is "Scientists raise quantum error threshold" which describes the achievement better than the Slashdot title.

    • more importantly, what is the overhead for the fault tolerance? does it affect real time latency? a quantum computer emulated in x86 hardware isn't very useful...
      • Re: (Score:3, Interesting)

        by kasperd (592156)

        what is the overhead for the fault tolerance?

        Most likely that depends on the error rate of the physical hardware. The more errors the fault tolerance has to deal with, the more overhead there will be.

        does it affect real time latency?

        Latency is not really what is important to quantum computers. The typical use case for quantum computers is long running computations. The more interesting question is by how large a factor does the number of qubits increase, and does the possible number of qubits in a quantum c

  • ... This is a qubit.

  • by kmac06 (608921) on Sunday November 14, 2010 @08:38PM (#34226694)
    Arxiv link [arxiv.org]
  • "The design is claimed to be the first that tolerates both qubit loss and decoherance to this extent."

    Can we check on the cat now?
  • My iPod will sync before I plug it in?
  • a new implementation of the "she'll be right, mate!" algorithm, or the "no wucken furries!" paradigm?

Some people claim that the UNIX learning curve is steep, but at least you only have to climb it once.

Working...