Is there an "official" industry term for the 99.9% / "three nines" fidelity threshold in quantum computing?

I keep seeing companies (Quantinuum, IonQ, Google) casually refer to hitting "three nines" or "four nines" two-qubit gate fidelity, and it's clearly shorthand borrowed from the uptime/SLA world (reliability engineering). But I can't find a consistent, formal name for this convention as applied to quantum hardware specifically. Specifically I'm trying to figure out: Is there a standard/citable term for the "N nines" notation itself (e.g., "nines notation," "N-nines threshold," something more formal)? Is "three nines" (99.9%) actually the same thing as the surface-code threshold, or are these two related-but-distinct concepts that just happen to land near the same number? I've seen both terms used almost interchangeably in press coverage and I want to know if that's actually correct or just sloppy reporting. Is there a more precise/academic term I should be using instead of "fault-tolerance threshold" when referring to the 99.9% figure specifically? Trying to nail down consistent terminology for a research comparing gate fidelity claims across Quantum Computing Induatry, and want to make sure I'm not conflating two different concepts under one loose label. Papers/sources are welcome, trying to cite this properly rather than just repeat the marketing shorthand. submitted by /u/No_Initiative5265 [link] [comments]