Rigetti reports 99.5% median two-qubit gate fidelity on a modular 36-qubit system, halving its two-qubit error rate
On 2025-07-16 Rigetti Computing announced it had achieved its mid-year milestone of 99.5% median two-qubit gate fidelity on a modular 36-qubit system composed of four 9-qubit chips tiled together, per a Form 8-K (Item 8.01) filed 2025-07-18. Rigetti said the result represents a roughly 2x reduction in median two-qubit gate error rate versus its prior best on the single-chip 84-qubit Ankaa-3 system, implemented with CZ gates.
A named-metric, 8-K-disclosed benchmark (99.5% median 2Q fidelity, 2x error reduction) on a multi-chip modular architecture is a credible, self-reported advance toward scalable superconducting systems for a tracked pure-play, matching the score-6 'credible benchmark with sub-domain implications' anchor; the figure remains self-reported pending third-party verification.
Demonstrating that a tiled multi-chip module can match or improve fidelity over a larger single chip supports Rigetti's chiplet scaling thesis and is the kind of architectural-direction signal that affects how investors weigh modular versus monolithic superconducting roadmaps.