3 articles · Updated · newsreleases.sandia.gov · Jun 17
Summary
A Nature paper said Quantinuum’s 98-qubit Helios system achieved 99.9975% one-qubit fidelity and 99.921% two-qubit fidelity, making it the company’s largest and most reliable quantum computer so far.
Sandia independently evaluated and certified Helios using its own debugging and benchmarking tools, including a new method for measuring mid-circuit readouts that are critical for quantum error correction.
The results were presented as progress toward fault-tolerant quantum computing, with Sandia saying reliability—not raw speed—is the key hurdle for systems meant to solve complex scientific and national-security problems.
The findings also extend a four-year Sandia-Quantinuum partnership, renewed in May, under which Sandia helps design and test integrated photonics components for future trapped-ion quantum platforms.
With 98 qubits, how far is Helios from breaking modern encryption, a task needing over a million qubits?
Beyond scientific benchmarks, when will quantum computers deliver tangible solutions for industries like pharmaceuticals or finance?
Helios Quantum Computer Achieves 94 Logical Qubits with Break-Even Fidelity: Quantinuum’s Breakthrough in Scalable, Fault-Tolerant Quantum Computing
Overview
In early 2026, Quantinuum announced a major breakthrough with its Helios quantum system, successfully creating 94 fully entangled logical qubits using 98 physical qubits. This achievement set new industry records, including one of the largest GHZ states ever recorded, and marked a crucial step toward more robust and reliable quantum computers. The creation of these logical qubits demonstrates significant progress in error correction and system stability, highlighting Helios’s role in advancing the field and paving the way for future scalable quantum technologies.