Helios: A 98-qubit trapped-ion quantum computer

TL;DR

Helios is a 98-qubit trapped-ion quantum computer with high fidelity operations, all-to-all connectivity, and advanced software, demonstrating capabilities beyond classical simulation and setting new standards in quantum computing performance.

Contribution

This work introduces Helios, a large-scale trapped-ion quantum processor with innovative architecture, high-fidelity gates, and real-time software, advancing quantum hardware capabilities.

Findings

Achieved average infidelities of 2.5e-5 for single-qubit gates

Demonstrated two-qubit gate infidelity of 7.9e-4

System operates beyond classical simulation limits

Abstract

We report on Quantinuum Helios, a 98-qubit trapped-ion quantum processor based on the quantum charge-coupled device (QCCD) architecture. Helios features $^{137}$Ba$^{+}$ hyperfine qubits, all-to-all connectivity enabled by a rotatable ion storage ring connecting two quantum operation regions by a junction, speed improvements from parallelized operations, and a new software stack with real-time compilation of dynamic programs. Averaged over all operational zones in the system, we achieve average infidelities of $2.5(1)\times10^{-5}$ for single-qubit gates, $7.9(2)\times10^{-4}$ for two-qubit gates, and $4.8(6)\times10^{-4}$ for state preparation and measurement, none of which are fundamentally limited and likely able to be improved. These component infidelities are predictive of system-level performance in both random Clifford circuits and random circuit sampling, the latter demonstrating that Helios operates well beyond the reach of classical simulation and establishes a new frontier of fidelity and complexity for quantum computers.