University of Tokyo pair invent loop-based quantum computing technique

https://www.japantimes.co.jp/news/2017/09/24/national/science-health/university-tokyo-pair-invent-loop-based-quantum-computing-technique/#.WckRKhNSxFR

by vortexo • 9 years ago

130 7 9 years ago

japantimes.co.jp

localcdn• 9 years ago

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.11...

roywiggins• 9 years ago

"resolved all problems except how to make a scheme that automatically corrects a calculation error"

I'm sure I've read suggestions that quantum error correction might be the limiting factor in quantum computation. That is, without error correction you don't have a working quantum computer at all, and quantum error correction is in some ways the hard part (other than all the other hard parts).

otakucode• 9 years ago

I admit fully that I might simply not understand what work the researchers have done. But, that being said, that quote you gave made me laugh out loud and say 'oh, is that all?' There are many barriers here though, language barriers and the inevitable press release 'dumb it down' barrier. Hopefully that was just an accident of phrase.

jamestimmins• 9 years ago

Reminds me of a comparison someone made last week: "that's like saying 'we made a spaceship that can fly at warp speed. All we need to do now is build the warp drive'".

cyphar• 9 years ago

On the quantum storage end of things, automated error correction of quantum storage is the holy grail at the moment. Traditional storage gets automatic error correction from being able to store data in a 2D grid (effectively this results in the energy required to flip a bit increasing with the circumference of the region of flipped bits -- causing errors to be harder to compound). Quantum storage still isn't there yet, as the boundary conditions required to provide the same properties as traditional error correcting storage currently theoretically require a 4D structure (though there's still hope that it can be done in 3D with a clever enough idea). Quantum storage does have an active error correction scheme (if you continually do rescans of your quantum storage you can correct errors, but the overall energy required for a recoverable error to become an irrecoverable error is zero -- so leaving your storage alone will result in errors eventually).

thethirdone• 9 years ago

Reddit discussion: https://www.reddit.com/r/science/comments/72bnel/japanese_sc...

Full Text: https://arxiv.org/abs/1706.06312

University of Tokyo pair invent loop-based quantum computing technique

Related Stories