Quantinuum Launches Helios: Most Accurate Quantum Computer

Quantinuum announces the commercial launch of Helios, its most advanced trapped-ion quantum computer, featuring 98 physical qubits and a world-leading 99.921% two-qubit gate fidelity using barium-137 ions — a first in quantum computing. Helios achieves 48–94 logical (error-corrected) qubits with 99.99% state preparation and measurement fidelity, representing a major step toward fault-tolerant computation. The system introduces Guppy, a Python-based programming language for hybrid quantum-classical algorithms.