IonQ Shows 99.3%-99.5% Fidelity Edge Over Rigetti's 99.1% as Connectivity Offsets Slower Gates
Updated
Updated · Yahoo Finance · Sep 16
IonQ Shows 99.3%-99.5% Fidelity Edge Over Rigetti's 99.1% as Connectivity Offsets Slower Gates
3 articles · Updated · Yahoo Finance · Sep 16
Summary
IonQ’s more comparable Forte systems posted median 2-qubit fidelity of 99.3% to 99.5%, modestly ahead of Rigetti’s roughly 99.1% on its 108-qubit Cepheus machine.
That narrower gap matters because 99.5% fidelity implies about a 0.5% error rate, versus roughly 0.9% for Rigetti — making Rigetti’s error rate about 1.8 times higher in this comparison.
IonQ also holds an architectural advantage with all-to-all qubit connectivity, letting any qubit interact directly and reducing extra SWAP operations that can add errors in less connected systems.
Rigetti still leads sharply on speed: its 2-qubit gates run in about 60 nanoseconds, while IonQ’s Forte systems take roughly 950 microseconds, highlighting the tradeoff between accuracy, connectivity and gate speed.