In 2019, Google's Sycamore quantum computer achieved a so-called quantum supremacy record by completing a specific task in 200 seconds that would have taken a classical supercomputer 10,000 years to finish. There was a bit of controversy around this achievement, but by and large, Google's claim has withstood the test of time – until now. Last month, a company called Quantinuum said it reached an error correction performance threshold that many believed was years away.
A new 56-qubit H2-1 computer has dislodged Google's Sycamore quantum computer from its 'quantum supremacy' record by 100-fold.
That title now belongs to a computing company called Quantinuum, which ran multiple experiments on its quantum computer between January and June 2024. It claims that its machine hit an error correction performance threshold that many experts believed was still years away.
The company published its results last month in a study uploaded to the preprint database arXiv. The study has not been peer-reviewed yet.
Quantinuum maintains that it has demonstrated a significant performance improvement using the Random Circuit Sampling algorithm. It achieved an estimated linear cross entropy benchmark (XEB) score of ~0.35, over 100 times better than previous demonstrations.T
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