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How to Evaluate Computers that Don't Quite Exist


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IBM's 50-qubit quantum computer.

Researchers found a quantum computer built at the University of Maryland ran a majority of 12 test algorithms more accurately than quantum systems from IBM or Rigetti Computing.

Credit: Nick Summers

A team of researchers led by Princeton University's Margaret Martonosi compared quantum computers developed by IBM, Rigetti Computing, and the University of Maryland (UMD), and found the UMD machine—which uses trapped ions—ran a majority of 12 test algorithms more accurately than the other two systems.

The researchers found the five-qubit ion-based UMD machine solved most test problems correctly 90% of the time, compared with 50% or less for the superconducting qubit machines at IBM and Rigetti.

The UMD machine has an advantage because every ion interacts with all the others in the system; in quantum computers that rely on superconducting chips (as IBM’s and Rigetti’s devices do), each qubit interacts only with its neighbors.

From Science Magazine
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Abstracts Copyright © 2019 SmithBucklin, Washington, DC, USA


 

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