Communications of the ACM
How Gate Set Tomography Diagnostic Validates Quantum Processors
Sandia researchers Andrew Baczewski (left) and Erik Nielsen (right) are among the authors of newly published research on precision tomography.
Credit: Rebecca Gustaf / Sandia National Laboratories
A precision diagnostic developed at the U.S. Department of Energy's Sandia National Laboratories is emerging as a gold standard for detecting and describing problems inside quantum computing hardware.
Two papers published in the journal Nature describe how separate research teams — one including Sandia researchers — used a Sandia technique called gate set tomography to develop and validate highly reliable quantum processors.
Sandia scientists collaborated with researchers at the University of New South Wales on "Precision Tomography of a Three-Qubit Donor Quantum Processor in Silicon," Together, they used GST to show that a sophisticated, three-qubit system comprising two atomic nuclei and one electron in a silicon chip could be manipulated reliably with 99%-plus accuracy.
In "Quantum Logic with Spin Qubits Crossing the Surface Code Threshold," a group led by Professor Lieven Vandersypen at Delft University of Technology used gate set tomography to demonstrate the important milestone of 99%-plus accuracy but with a different approach, controlling electrons trapped within quantum dots instead of isolated atomic nuclei.
From Sandia National Laboratories
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