team of researchers affiliated with multiple institutions in China,
working at the University of Science and Technology of China, has
achieved another milestone in the development of a usable quantum
computer. The group has written a paper describing its latest efforts
and have uploaded it to the arXiv preprint server.
Back in 2019, a team at Google announced that they had achieved "quantum supremacy" with their Sycamore machine—a 54 qubit processor that carried out a calculation that would have taken a traditional computer approximately 10,000 years to complete.
But that achievement was
soon surpassed by other teams from Honeywell and a team in China. The
team in China used a different technique, one that involved the use of
photonic qubits—but it was also a one-trick pony. In this new effort,
the new team in China, which has been led by Jian-Wei Pan, who also led
the prior team at the University of Science and Technology has achieved
new effort was conducted with a 2D programable computer called
Zuchongzhi—one equipped to run with 66 qubits. In their demonstration,
the researchers used only 56 of those qubits to tackle a well-known
computer problem—sampling the output distribution of random quantum
circuits. The task requires a variety of computer abilities that involve mathematical analysis, matrix theory, the complexity of certain computations and probability theory—a
task approximately 100 times more challenging than the one carried out
by Sycamore just two years ago. Prior research has suggested the task
set before the Chinese machine would take a conventional computer
approximately eight years to complete. Zuchongzhi completed the task in
less than an hour and a half. The achievement by the team showed that
the Zuchongzhi machine is capable of tackling more than just one kind of
task. It also showed that adding just two more qubits than that used by
Sycamore could increase the power of a quantum computer exponentially.
But perhaps more importantly, it demonstrates that computer scientists
are moving ever closer to the real prize—the development of a
generalized quantum computer that can be used for a host of real-world
applications that traditional computers will never be able to handle.
More information: Strong quantum computational advantage using a superconducting quantum processor, arXiv:2106.14734 [quant-ph] arxiv.org/abs/2106.14734