Limits RegistryPUBLIC RECORD
Limits RegistryIn June 2023, IBM published a Nature paper reporting that its 127-qubit Eagle processor produced accurate results for simulating a physical system (the kicked Ising model) at a scale where the authors argued exact brute-force classical simulation was intractable with available methods, using error-mitigation rather than full error correction. IBM termed this 'utility' rather than 'supremacy,' and other groups subsequently developed improved classical tensor-network methods that reproduced or approximated some of the same results, illustrating how quickly the classical-versus-quantum boundary can shift.
The question, scope, and sources behind this Registry record.
In June 2023, IBM published a Nature paper reporting that its 127-qubit Eagle processor produced accurate results for simulating a physical system (the kicked Ising model) at a scale where the authors argued exact brute-force classical simulation was intractable with available methods, using error-mitigation rather than full error correction. IBM termed this 'utility' rather than 'supremacy,' and other groups subsequently developed improved classical tensor-network methods that reproduced or approximated some of the same results, illustrating how quickly the classical-versus-quantum boundary can shift.
The number of qubits used in IBM's 127-qubit Eagle processor experiment, which the authors argued produced results that classical brute-force simulation methods available at publication could not reproduce, without claiming full fault-tolerant quantum advantage.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-IBM-EAGLE-QUANTUM-UTILITY
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-IBM-EAGLE-QUANTUM-UTILITY. Largest quantum circuit demonstrating computational utility beyond brute-force classical simulation. 2026.