SAN FRANCISCO: IBM announced on Wednesday that it has built a new experimental quantum computing chip called Loon that demonstrates it has hit a key milestone toward making useful quantum computers before the end of the decade.

Quantum computers could someday solve problems that would take classical computers thousands of years. But due to the uncertain nature of quantum mechanics, the chips are prone to errors.

Correcting those errors is the key focus of tech giants such as Alphabet’s Google and Amazon that are chasing quantum computers alongside IBM. In 2021, IBM proposed a new way of doing error correction: adapt an algorithm for improving cellphone signals to quantum computing and run it on a combination of quantum chips and classical computing chips.

The downside of IBM’s idea is that the quantum chips become harder to build because they must contain not only basic building blocks of quantum chips called “qubits” but also new quantum connections between the qubits, Mark Horvath, a vice president and analyst at research firm Gartner, told Reuters in an interview.

“It’s very, very clever,” Horvath said. “Now, they’re actually putting it in chips, so that’s super exciting.” Jay Gambetta, director of IBM Research and an IBM fellow, said the key was tapping the Albany NanoTech Complex in New York, which houses the same chipmaking tools as the most advanced factories in the world.

Loon remains in its early stages, and IBM did not disclose when outsiders can test it. But the company also announced on Wednesday a chip named “Nighthawk” that will be available at the end of this year.

Published in Dawn, November 13th, 2025