China claims quantum supremacy

7 min read
China claims quantum supremacy

Chinese scientists claim to have built a quantum computer that is able to perform certain computations nearly 100 trillion times faster than the world’s most advanced supercomputer, representing the first milestone in the country’s efforts to develop the technology.

The researchers have built a quantum computer prototype that is able to detect up to 76 photons through Gaussian boson sampling, a standard simulation algorithm, the state-run Xinhua news agency said, citing research published in Science magazine. That’s exponentially faster than existing supercomputers.

The breakthrough represents a quantum computational advantage, also known as quantum supremacy, in which no traditional computer can perform the same task in a reasonable amount of time and is unlikely to be overturned by algorithmic or hardware improvements, according to the research.

While still in its infancy, quantum computing is seen as the key to radically improving the processing speed and power of computers, enabling them to simulate large systems and drive advances in physics, chemistry and other fields. Chinese researchers are competing against major U.S. corporations from Alphabet Inc.’s Google to Amazon.com Inc. and Microsoft Corp. for a lead in the technology, which has become yet another front in the U.S.-China tech race.

Google said last year it has built a computer that could perform a computation in 200 seconds that would take the fastest supercomputers about 10,000 years, reaching quantum supremacy. The Chinese researchers claim their new prototype is able to process 10 billion times faster than Google’s prototype, according to the Xinhua report.

Xi Jinping’s government is building a $10 billion National Laboratory for Quantum Information Sciences as part of a big push in the field. In the U.S., the Trump administration provided $1 billion in funding to research into artificial intelligence and quantum information earlier this year and has sought to take credit for Google’s 2019 breakthrough.

Last year Google won international acclaim when its prototype quantum computer completed a calculation in minutes that its researchers estimated would have taken a supercomputer 10,000 years. That met the definition for quantum supremacy—the moment a quantum machine does something impractical for a conventional computer.

Thursday, China’s leading quantum research group made its own declaration of quantum supremacy, in the journal Science. A system called Jiuzhang produced results in minutes calculated to take more than 2 billion years of effort by the world’s third-most-powerful supercomputer.

The two systems work differently. Google builds quantum circuits using supercold, superconducting metal, while the team at University of Science and Technology of China, in Hefei, recorded its result by manipulating photons, particles of light.Advertisement

No quantum computer is yet ready to do useful work. But the indications that two fundamentally different forms of the technology can outperform supercomputers will buoy the hopes—and investments—of the embryonic industry. Chao-Yang Lu, a physics professor at the University of Science and Technology who worked on the project, calls the milestone “a necessary step” toward a “large-scale fault-tolerant quantum computer.”

Google and rivals including IBM, Microsoft, Amazon, Intel, and several large startups have all spent heavily on developing quantum computing hardware in recent years. Google and IBM offer access to their latest prototypes over the internet, while Microsoft’s and Amazon’s cloud platforms each host a smorgasbord of quantum hardware from others, including Honeywell.

The potential power of quantum computers springs from their basic building blocks, dubbed qubits. Like the bits of conventional computers, they can represent 0s and 1s of data; but qubits can also exploit quantum mechanics to attain an unusual state called a superposition that encapsulates the possibilities of both. With enough qubits it’s possible to take computational shortcuts conventional computers can’t—an advantage that grows as more qubits work together.

Everything you ever wanted to know about qubits, superpositioning, and spooky action at a distance.

Quantum computers don’t yet rule the world, because engineers haven’t been able to get enough qubits working together reliably enough. The quantum mechanical effects they depend on are very delicate. Google and the Chinese group were able to stage their supremacy experiments because they managed to corral qubits in relatively large numbers.

Google’s experiment used a superconducting chip dubbed Sycamore with 54 qubits, cooled to fractions of a degree above absolute zero. One qubit didn’t workbroke but the remaining 53 were enough to demonstrate supremacy over conventional computers on a carefully chosen statistical problem. It’s unclear just how many good quality qubits are needed for a quantum computer to do useful work; expert estimates range from hundreds to millions.

The Chinese team also used a statistical test to stake its claim of quantum superiority, but its quantum data carriers take the form of photons traveling through optical circuits laid out on a lab bench, guided by mirrors. Each photon read out at the end of the process can be thought of as is roughly equivalent to reading out a qubit on a processor like Google’s, revealing the result of a calculation.

The researchers reported measuring as many as 76 photons from the Jiuzhang machine but averaged a more modest 43. Members wrote code to simulate the work of the quantum system on Sunway TaihuLight, China’s most powerful supercomputer and the world’s third fastest, but it couldn’t come close. The researchers calculate the supercomputer would have required more than 2 billion years to do what Jiuzhang did in a little over 3 minutes.

The Chinese team was led by Jian-Wei Pan, whose sizable research team has benefited from a Chinese government effort to be more prominent in quantum technology. Their achievements include demonstrating use of quantum encryption over record-breaking distances, including using a satellite specially designed for quantum communications to secure a video call between China and Austria. Encryption rooted in quantum mechanics is theoretically unbreakable, although in practice it could still be subverted.

“It’s a milestone in photonic quantum computing, but also good for all of us.”

Christian Weedbrook, CEO and founder, Xanadu

One difference between Jiuzhang and Google’s Sycamore is that the photonic prototype is not easily reprogrammable to run different calculations. Its settings were effectively hard coded into its optical circuits. Christian Weedbrook, CEO and founder of Toronto quantum computing startup Xanadu, which is also working on photonic quantum computing, says the result is still notable as a reminder that there are multiple viable paths to making quantum number crunching work. “It’s a milestone in photonic quantum computing,” he says, “but also good for all of us.”Advertisement

Several different forms of quantum hardware are being developed in academia and industry. Qubits based on superconducting circuits are the most prominent, in part thanks to heavy investment from Google and IBM. Quantum computers made from qubits based on individual atoms levitated in electric fields, called ion traps, are offered by industrial giant Honeywell and startups including IonQ, and are available via Amazon’s and Microsoft’s cloud services.

Weedbrook, who put his first prototypes online for early customers in September with up to 12 qubits, says his team can make more flexible devices than Jiuzhang and believes photonic quantum computers can soon catch up with other forms. They have the advantage of using the same components used in many telecommunications networks.

Lu of the China team says it is also working on larger and more tunable versions of Jiuzhang. Other researchers have shown that the operation used in the group’s supremacy experiment could be adapted for studying the properties of molecules or solving problems involving mathematical graphs, which crop up in areas including transportation and social networks.

Proponents of photonic quantum computing and ion traps both say their technologies should be easier to scale than the superconducting chips favored by IBM and Google, because they don’t have to build their devices inside ultracold refrigerators. However, no one knows for sure which form of quantum computing will prove to be useful first. “We all have pros and cons,” Weedbrook says.

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