Google’s quantum computer instantly makes calculations that take rivals 47 years

From SMH.com (July 3, 2023):

Google has developed a quantum computer that instantly makes calculations that would take the best existing supercomputers 47 years, in a breakthrough meant to establish beyond doubt that the experimental machines can outperform conventional rivals.

A paper from researchers at Google published online claims that the company’s latest technology is “beyond the capabilities of existing classical supercomputers”.

Proponents of quantum computers say the technology, which relies on the peculiar states of quantum physics, can create hugely powerful machines able to battle climate change and create breakthrough drugs.

However, they also threaten to undermine today’s encryption systems, making them a national security priority.

Four years ago, Google claimed to be the first company to achieve “quantum supremacy” – a milestone point at which quantum computers surpass existing machines.

This was challenged at the time by rivals, which argued that Google was exaggerating the difference between its machine and traditional supercomputers.

The company’s new paper – Phase Transition in Random Circuit Sampling – published on the open access science website ArXiv, demonstrates a more powerful device that aims to end the debate.

While the 2019 machine had 53 qubits, the building blocks of quantum computers, the next-generation device has 70.

Adding more qubits improves a quantum computer’s power exponentially, meaning the new machine is 241 million times more powerful than the 2019 machine. [read more]