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posted by Fnord666 on Sunday December 31 2017, @03:51PM   Printer-friendly
from the new-and-improved-defects dept.

Making an unconventional computer using conventional technology

In their quest to build a quantum computer, researchers from RIKEN are turning to well-established, silicon-based manufacturing techniques currently used in the electronics industry. [...] Making a fully functional quantum computer will require connecting huge numbers of qubits—of the order of a 100 million or more.

[...] Keiji Ono and colleagues from the RIKEN Center for Emergent Matter Science and the Toshiba Corporation in Japan, in collaboration with researchers from the United States, are investigating the properties of qubits produced by imperfections or defects in silicon MOSFETs. In particular, they are exploring their potential for developing quantum computing devices that are compatible with current manufacturing technologies.

"Companies like IBM and Google are developing quantum computers that use superconductors," explains Ono. "In contrast, we are attempting to develop a quantum computer based on the silicon manufacturing techniques currently used to make computers and smart phones. The advantage of this approach is that it can leverage existing industrial knowledge and technology."

After cooling a silicon MOSFET to 1.6 kelvin (−271.6 degrees Celsius), the researchers measured its electrical properties while applying a magnetic field and a microwave field. They found that when the silicon MOSFET was neither fully turned on nor off, a pair of defects in the silicon MOSFET formed two quantum dots in close vicinity to each other. This 'double quantum dot' generated qubits from the spin of electrons in the dots. It also produced quantum effects that can be used to control these qubits.

Hole Spin Resonance and Spin-Orbit Coupling in a Silicon Metal-Oxide-Semiconductor Field-Effect Transistor (DOI: 10.1103/PhysRevLett.119.156802) (DX)


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  • (Score: 3, Touché) by takyon on Sunday December 31 2017, @05:25PM (3 children)

    by takyon (881) <reversethis-{gro ... s} {ta} {noykat}> on Sunday December 31 2017, @05:25PM (#616163) Journal

    You know how many of these articles I go through? My feed reader is crashing trying to delete old RSS items. If you want to pick the headline, you should submit the story.

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  • (Score: 2) by acid andy on Sunday December 31 2017, @07:46PM

    by acid andy (1683) on Sunday December 31 2017, @07:46PM (#616187) Homepage Journal

    Well, to be fair, you were just quoting the language used in TFA.

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  • (Score: 4, Interesting) by requerdanos on Sunday December 31 2017, @09:42PM (1 child)

    by requerdanos (5997) Subscriber Badge on Sunday December 31 2017, @09:42PM (#616223) Journal

    You seem to really take these summaries to heart, likewise criticism of same.

    I think I speak for most here when I say that we appreciate what you do, we thank you for both tfh and tfs, and when we engage in [warranted|petty|pedantic|right|wrong] criticism of the subject matter or its words, it's not aimed at you but rather past you to the story source, and no offense or lack of gratitude is intended.

    (Unless someone grumbles about "the eds" as if they were reading a certain other site...)