Google’s Quantum Chip Willow: Redefining the Future of Computing

Google's remarkable progress with its Willow quantum chip is overshadowed by performance metrics that raise questions.

Google Unveils Willow, Its New Quantum Processor

Last Wednesday, Google introduced its latest technological marvel: Willow, a new quantum processor. The announcement was met with extensive media coverage and praise. Willow is said to be capable of performing computations that would take a classical computer longer than the universe’s age—14 billion years—to complete. However, the true significance of this technological feat is more nuanced.

Willow Does Not Claim Quantum Supremacy

Unlike its 2019 announcement of the Sycamore quantum computer, Google is not claiming quantum supremacy with Willow. To recall, Google had declared Sycamore could perform a calculation in 200 seconds that would take the fastest classical computer of the time 10,000 years, sparking some controversy as some researchers called the claim “indefensible” and “utterly false.”

Willow and the Random Circuit

Willow is designed to outperform classical computers in a specific task known as “random circuit sampling” or RCS. Google claims that Willow can complete its latest RCS test in under five minutes, a task that would take the supercomputer Frontier, currently the world’s second most powerful, 10 septillion years to achieve. This breakthrough, according to Google, “lends credence to the idea that quantum computing occurs across many parallel universes, consistent with the theory that we live in a multiverse.”

Willow, a Step Toward a Practical Quantum Computer

The significant advancement Google claims with Willow is its ability to reduce errors as more qubits are added to the system. This is the first time this has been achieved, according to the company. “As the first system below the threshold, it is the most convincing prototype of a scalable logical qubit built to date. It’s a strong indication that large, useful quantum computers can indeed be built,” states Hartmut Neven, founder of Google Quantum AI.

Willow thus brings humanity closer to developing quantum computers that can solve problems with tangible impacts on people’s lives. However, even Google admits there is still much work to be done to achieve this.