The article compares IonQ, which uses trapped-ion technology, with Rigetti Computing, which uses superconducting qubits. IonQ unveiled a 256-qubit computer this year, aims for two million qubits by 2030, and reached 99.99% two-qubit gate fidelity; its second-quarter revenue soared 287% to $80 million. Rigetti's Cepheus-1-108Q operates at a 60-nanosecond gate speed and its latest revenue rose 185%, but more than 90% of its revenue comes from government contracts, and it targets 1,000 qubits within three years. Both stocks have fallen more than 30% this year. The author judges IonQ the better option for the next five years, citing lower risk, strong growth and $3 billion in cash.
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