Layer fidelity (error per layered gate) (EPLG)
The error per two-qubit gate when many gates run at once across a chain of qubits, which captures interference between neighbouring qubits.
When results can be compared
Depends on the length of the qubit chain tested (often 100 qubits). Compare only the same chain length.
Where it comes from
IBM researchers (McKay, Hincks, Pritchett and colleagues), 2023. Note: Created by IBM, a hardware maker.
- Type
- Measurement, system level
- Unit
- error per layered gate
- Better is
- Lower
- Applies to
- gate-based machines
Results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| IBM Heron r3 | 3.08 × 10⁻³ | eplg 100 metriq | 9 Mar 2026 | Independent | B | r-000059 |
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| Quantinuum H2 | 1.73 × 10⁻³ | eplg 50 metriq | 9 Mar 2026 | Independent | B | r-000060 |
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| IBM Heron r3 | 2.69 × 10⁻³ | eplg 100 ibm | – | Maker | B | r-000010 |
| IBM Heron r2 | 3.44 × 10⁻³ | eplg 100 ibm | – | Maker | B | r-000012 |
| IBM Nighthawk r2 | 2.61 × 10⁻³ | eplg 100 ibm | – | Maker | B | r-000013 |