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ibm_brisbane (Eagle r3)
ibm_brisbane (Eagle r3) is a superconducting gate-based processor by IBM with 127 qubits. Below: every publicly disclosed figure with its source, method, and vendor-claim status — plus what is not disclosed, recorded as findings.
Measurement records8 disclosed · 1 not disclosed · 3 sources
Select a figure to open its record
Qubit count (qubit_count_physical)127 qubitsvendor claim
Vendor claim
- Method
- VENDOR_UNSPECIFIED
- Notes
- Eagle r3 processor
- Citation key
[ibm/ibm-brisbane:qubit-count-physical:2026-08-19]
Two-qubit gate quality (two_qubit_gate_error)8.335E-3verified
Independently corroborated
- Source
- IBM Quantum Computers: Evolution, Performance, and Future Directions (arXiv:2410.00916, Table 8) · published 2024-09-17
- Method
- IBM calibration data (randomized-benchmarking-derived per-gate ECR error) as reported in third-party review
- Aggregation
- median ECR error across device, as of 2024-07-03
- Notes
- Third-party paper reporting IBM's own calibration data. A second independent paper (arXiv:2406.06288) reports ECR error 8.082E-3 circa June 2024 — consistent, calibration drifts daily. Device retired 2025-11-03, so no live value exists.
- Citation key
[ibm/ibm-brisbane:two-qubit-gate-error:2026-08-19]
Single-qubit gate quality (one_qubit_gate_error)2.669E-4verified
Independently corroborated
- Source
- Identifying Bottlenecks of NISQ-friendly HHL algorithms (Marfany, Sakhnenko, Lorenz, arXiv:2406.06288v2, Appendix A) · published 2024-08-02
- Method
- IBM calibration data (SX gate error) as reported in third-party paper
- Aggregation
- SX error across device (paper labels it mean), circa June 2024
- Citation key
[ibm/ibm-brisbane:one-qubit-gate-error:2026-08-19]
Coherence (T1)217.83 microsecondsverified
Independently corroborated
- Source
- Identifying Bottlenecks of NISQ-friendly HHL algorithms (arXiv:2406.06288v2, Appendix A) · published 2024-08-02
- Method
- IBM calibration data as reported in third-party paper
- Aggregation
- median across 127 qubits, circa June 2024
- Citation key
[ibm/ibm-brisbane:t1:2026-08-19]
Coherence (T2)129.77 microsecondsverified
Independently corroborated
- Source
- Identifying Bottlenecks of NISQ-friendly HHL algorithms (arXiv:2406.06288v2, Appendix A) · published 2024-08-02
- Method
- IBM calibration data as reported in third-party paper
- Aggregation
- median across 127 qubits, circa June 2024
- Citation key
[ibm/ibm-brisbane:t2:2026-08-19]
Readout (readout_error)1.240E-2verified
Independently corroborated
- Source
- Identifying Bottlenecks of NISQ-friendly HHL algorithms (arXiv:2406.06288v2, Appendix A) · published 2024-08-02
- Method
- IBM calibration data as reported in third-party paper
- Aggregation
- median, circa June 2024
- Citation key
[ibm/ibm-brisbane:readout-error:2026-08-19]
Gate duration (two_qubit_gate_duration)660 nanosecondsverified
Independently corroborated
- Source
- IBM Quantum Computers: Evolution, Performance, and Future Directions (arXiv:2410.00916) · published 2024-09-17
- Method
- IBM calibration data (default ECR pulse duration 1320 dt at 0.5 ns sampling)
- Aggregation
- median ECR gate time, as of 2024-07-03
- Citation key
[ibm/ibm-brisbane:two-qubit-gate-duration:2026-08-19]
Throughput (CLOPS)not publicly disclosed
Not publicly disclosed — checked 2026-08-19
- Finding
- No public disclosure found. This is a recorded, dated finding — we do not substitute an estimate or borrow a figure from a sibling device.
- Sources queried
- quantum.cloud.ibm.com/docs/en/guides/retired-qpus; arXiv:2410.00916 tables; web search for ibm_brisbane CLOPS
- Notes
- Device retired; historical CLOPS value not found in a fetchable primary or peer-reviewed source this session
Retirement (retirement)retired 2025-11-03vendor claim
Vendor claim
- Method
- VENDOR_UNSPECIFIED
- Notes
- Changelog: 'The quantum computer ibm_brisbane has been retired and will no longer accept workload submissions.' Sibling Heron r1 ibm_torino (133q) retired 2026-04-01.
- Citation key
[ibm/ibm-brisbane:retirement:2026-08-19]
QPU137 is independent and is not affiliated with, endorsed by, or sponsored by IBM. Figures above are public disclosures recorded with their sources on 2026-08-19; vendor claims are labeled as such and may not be directly comparable across measurement methods — see methodology.