These Canadian startups are taking quantum computing mainstream

It's not what you'd expect to find on the 29th floor of a Toronto office building. Instead of cubicles, a complex arrangement of lasers, mirrors and optical fibres run from floor to ceiling, making up the quantum computer called Borealis. 

And Borealis recently hit a milestone by solving a colossal math problem.

"If we ran [the problem] on the most powerful supercomputer out there, it would take 9,000 years. For Borealis, it takes less than a second, which is quite incredible," says Christian Weedbrook, CEO of Xanadu, the company that built Borealis.

Weedbrook said it's just the third time a quantum computer has tackled something out of reach for an ordinary computer, a scenario called quantum advantage. The first time was by Google in 2019, the second by a team of Chinese researchers in 2020. Xanadu's achievement was published earlier this summer in the magazine Nature.

For years, quantum computers have mostly been the focus of academics and government. Now, experts say we could be near a turning point where the technology is closer to commercialization.

"It's a really nice step showing that the technology is mature … and could be a candidate for more wide-scale adoption of quantum computers," said Anne Broadbent, an associate professor at the University of Ottawa where she researches quantum computing.

Weedbrook said the potential for quantum computers is almost limitless, opening the door to "solving important business problems in industries from finance to drug discovery and material design."

The concepts used in quantum computing may seem mind-bending, and they're very powerful. Ordinary computers encode information using zeros and ones, called binary digits — or bits for short. Using quantum physics, these supercomputers can use zeros, ones, or any value in between, in something known as quantum digits — or quibits. This allows them to perform calculations much faster on problems that are more complex.

But the big difference between the two types of computers is how they actually approach a problem. If a regular computer were to try to get through a maze, it would consider each possible route one at a time. A quantum computer would consider all the routes at once.

"Just adding one [quibit] doubles the computational capacity of your system," says Stephanie Simmons, an associate professor of physics at Simon Fraser University and a founder of Vancouver-based quantum startup Photonic. "It's exponential … so the scale is off the charts and that's the kind of power that we're hoping to leverage."

In July, Simmons and her team also had an innovation published in Nature: a silicon chip that holds 150,000 quibits. Since silicon is already so widely used in technology, Simmons says it will be easier to produce these beefier chips on a larger scale.

"What we see next is the commercialization of quantum, and so we'll start to see little glimmers and then all of a sudden it's going to change everything we do."

The race is on to build a universal quantum computer that can solve a wide array of problems. Startups in the sector are booming, with 23 quantum businesses based in Canada, according to McKinsey & Co., a global management consultant. The U.S. is the only country further ahead, sitting at 59 quantum-related startups.

Weedbrook said the growth in this field offers an opportunity to attract scientific talent to the country.