Physicists find a way to reach universal quantum computing using exotic anyons, skipping one of the most expensive steps in error correction

[AlexandrZakharyan]

A team of researchers spanning Harvard, the University of Chicago, Stony Brook University and quantum computing company Quantinuum has demonstrated that exotic quantum particles known as non-Abelian anyons can be used to perform every operation required for universal quantum computing, a genuine milestone that had remained out of reach since these particles were first successfully created back in 2024. That earlier work showed the particles could be produced and braided around one another, but braiding alone turned out to be insufficient to actually achieve universal computation on its own.

The new research, published in Nature and led by Chiu Fan Bowen Lo and Anasuya Lyons at Harvard alongside Ruben Verresen at the University of Chicago and Henrik Dreyer at Quantinuum, solved that gap by combining braiding operations with a separate process called fusion, using 54 qubits on Quantinuum's H2 trapped ion processor to create what are known as topological qutrits, three level quantum states that go beyond the simple zero or one of a standard qubit. Crucially, this combined approach can directly produce so called magic states, a special resource needed for fault tolerant quantum computation, without relying on the costly and resource intensive distillation process that conventional quantum error correction schemes currently require.

Dreyer described the significance of the achievement by calling non-Abelian codes a dark horse in the race toward practical quantum error correction, explaining that fault tolerant computations may now be able to proceed without resorting to magic state distillation at all, a process that currently consumes a substantial share of any quantum computer's available qubit capacity. If the approach scales successfully, it could offer a meaningfully more efficient path toward building genuinely fault tolerant quantum computers than the error correction strategies most of the industry currently relies on.

Quantum computing's "dark horse" just proved it can go universalwww.sciencedaily.com