Google says it has achieved a breakthrough in quantum computing research.
The technology giant said an experimental quantum processor has completed a calculation in just a few minutes that would take a traditional supercomputer thousands of years.
The findings, published in the scientific journal Nature, show that โquantum speed-up is achievable in a real-world system and is not precluded by any hidden physical lawsโ, the researchers wrote.
Quantum computing is a nascent and somewhat bewildering technology for vastly sped-up information processing.
Quantum computers might one day revolutionise tasks that would take existing computers years, including the hunt for new drugs and optimising city and transportation planning.
The technique relies on quantum bits, or qubits, which can register data values of zero and one โ the language of modern computing โ simultaneously.
Big tech companies including Google, Microsoft, IBM and Intel are avidly pursuing the technology.
โQuantum things can be in multiple places at the same time,โ said Chris Monroe, a University of Maryland physicist who is also the founder of quantum start-up IonQ. โThe rules are very simple, theyโre just confounding.โ
Googleโs findings, however, are already facing pushback from other industry researchers. A version of Googleโs paper leaked online last month and researchers caught a glimpse before it was taken down.
IBM quickly took issue with Googleโs claim that it had achieved โquantum supremacyโ, a term that refers to a point when a quantum computer can perform a calculation that a traditional computer cannot complete within its lifetime.
Googleโs leaked paper showed that its quantum processor, Sycamore, finished a calculation in three minutes and 20 seconds โ and that it would take the worldโs fastest supercomputer 10,000 years to do the same thing.
But IBM researchers say that Google underestimated the conventional supercomputer, called Summit, and said it could actually do the calculation in two and a half days. Summit was developed by IBM and is located at the Oak Ridge National Laboratory in Tennessee.
Google has not commented on IBMโs claims.
Whether or not Google has achieved โquantum supremacyโ or not may matter to competitors, but the semantics could be less important for the field of quantum research. What it does seem to indicate is that the field is maturing.
โThe quantum supremacy milestone allegedly achieved by Google is a pivotal step in the quest for practical quantum computers,โ John Preskill, a professor who originally coined the โquantum supremacyโ term, wrote in a column after the paper was leaked.
It means quantum computing research can enter a new stage, he wrote, though a significant effect on society โmay still be decades awayโ.
The calculation employed by Google has little practical use, Prof Preskill wrote, other than to test how well the processor works.
Press Association
