IonQ

IonQ is a US quantum-computing company using trapped-ion qubits — electrically charged atoms suspended in electromagnetic fields. The approach is slower than superconducting alternatives but offers higher accuracy.

Key Achievement

• 99.99% 2-qubit-gate-fidelity — achieved October 2025, the highest reported fidelity in the industry at the time.
• Compare: rigetti-computing prototype at 99.9%; Rigetti production at 99%.

IonQ is cited in drury-2026-rigetti-2-qubit-fidelity as the clear accuracy leader, making it a more compelling investment play than Rigetti.

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Sources: drury-2026-rigetti-2-qubit-fidelity, cottier-2026-quantum-computing-breakthroughs