Quantinuum's Helios trapped ion computer shows what comes after supercomputers

[Oliver85]

A new trapped ion quantum computer called Helios has become the largest machine of its kind ever built, running on 98 qubits and demonstrating a genuinely different architectural approach from the superconducting systems that companies like IBM and Google have mostly focused on. Built by Quantinuum, based in Cambridge, UK and Broomfield, Colorado, Helios more than doubles the qubit count of the company's own previous machine, which ran 56 qubits back in 2025, itself an upgrade from an earlier 32 qubit system in 2023.

Trapped ion systems work fundamentally differently from the fixed, chip based qubits found in superconducting quantum computers. Helios instead suspends individual charged atoms in free space using precisely controlled electromagnetic fields, then physically shuttles those ions back and forth between separate storage and processing zones using an architecture called a QCCD, short for quantum charge coupled device, a design first proposed back in 2002. The comparison to a classical computer's separate memory and processor is a genuinely useful one here, with Helios's storage region built as a large ring and its processing handled in two separate streamer sections, all connected through a critical four way junction shaped roughly like a rosette.

That four way junction is the specific engineering leap that sets Helios apart from earlier QCCD machines. Previous trapped ion systems could only move ions back and forth along a single line or loop, handling one task at a time in a strictly sequential fashion. Helios's junction lets the system route multiple ions through different paths simultaneously, dramatically speeding up throughput, and that hardware advance is paired with a new piece of classical control software called the Helios runtime, which plans out the fastest, smartest route for shuttling ions between storage and processing given the added freedom the two dimensional junction provides.

The payoff of this design shows up in a few concrete advantages. Because gates in a QCCD system only operate on ions that have been physically moved into a shared processing zone, gates applied to one pair of qubits do not create unwanted crosstalk with neighboring qubits sitting elsewhere in storage, improving overall computation quality. The architecture also allows qubits to be measured and reset mid computation, catching and correcting errors earlier than many alternative approaches allow, and because ions can be transported to very different physical parts of the memory system, even qubits that started out far apart can end up interacting directly, something considerably harder to arrange in fixed, chip bound architectures.

Helios has already run computations that would be effectively impossible for the largest existing classical supercomputers to complete using any presently known method within a reasonable amount of time or power. That said, the work performed so far has been limited to random benchmark tests rather than problems of genuine scientific or commercial value, and the longest single computation Helios has run involved roughly 4,000 operations across its 98 qubits, a tiny fraction of the trillion operation fault tolerant target that the UK's National Quantum Strategy has set as a longer term national mission. Reaching that kind of scale would likely require linking thousands of QCCD devices, each carrying thousands of qubits of their own, and researchers acknowledge that the physical process of transporting ions between zones remains inherently slow, a constraint that will only become more challenging as these systems continue growing larger.

The World's Largest Trapped Ion Quantum Computer Just Showed What Comes After Supercomputerswww.zmescience.com