Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.8456
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8456009201hartree
Shots1024
Runtime executionsingle-job
Resilience0
MappingPT
Active space2e,2o
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_brussels
- Resource type
- ibm quantum hardware
- Processor family
- Eagle r3
- Processor model
- —
- Processor revision
- —
- Qubits
- —
- Connectivity
- —
- Runtime execution
- single-job
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2026-03-06T23:43:40+01:00
- Wall time (s)
- 197
Molecular system
- Charge
- 0
- Multiplicity
- 1
- Basis
- STO-3G
- Active space
- 2e,2o
- Active electrons
- 2
- Spatial orbitals
- 2
- Geometry units
- angstrom
Circuit
- Logical qubits
- 1
- Physical qubits
- —
- Parameters
- —
- Depth
- 1
- Two-qubit gates
- 0
- Hamiltonian terms
- —
Dataset publication
Associated articles
- Accuracy-Cost Trade-offs for Reference VQE Calculations of H2 on IBM Quantum Hardware submitted to Quantum Science and Technology
- Accuracy-Cost Trade-offs for Reference VQE Calculations of H2 on IBM Quantum Hardware DOI 10.48550/arXiv.2604.11478 arXiv 2604.11478 published preprint
Compute access
- Fraunhofer Quantum Now and EQeS · IBM Quantum · allocation: Fraunhofer Quantum Now
Optimization trajectory
25 recorded objective evaluations. Charts use cumulative time so convergence cost remains comparable across calculations.
| Attempt | Outcome | Energy (Ha) | Elapsed (s) | Quantum (s) | Parameters |
|---|---|---|---|---|---|
| 1 | succeeded | -1.8096232334 | 4.85607 | 1 | — |
| 2 | succeeded | -0.5901181190 | 4.85083 | 1 | — |
| 3 | succeeded | -0.8594792092 | 5.7423 | 1 | — |
| 4 | succeeded | -1.3391515578 | 4.90394 | 1 | — |
| 5 | succeeded | -1.8167125800 | 46.7506 | 1 | — |
| 6 | succeeded | -1.7327097980 | 5.32911 | 1 | — |
| 7 | succeeded | -1.8279383741 | 5.41122 | 1 | — |
| 8 | succeeded | -1.8256684799 | 5.02945 | 2 | — |
| 9 | succeeded | -1.8210203558 | 6.05503 | 1 | — |
| 10 | succeeded | -1.8314700144 | 4.84363 | 1 | — |
| 11 | succeeded | -1.8275091034 | 4.75945 | 1 | — |
| 12 | succeeded | -1.8309778873 | 4.77277 | 1 | — |
| 13 | succeeded | -1.8263102137 | 5.30143 | 1 | — |
| 14 | succeeded | -1.8343642652 | 4.7472 | 1 | — |
| 15 | succeeded | -1.8229194915 | 5.14601 | 1 | — |
| 16 | succeeded | -1.8456009201 | 4.91761 | 1 | — |
| 17 | succeeded | -1.8253216151 | 5.16744 | 1 | — |
| 18 | succeeded | -1.8160643297 | 8.5077 | 5 | — |
| 19 | succeeded | -1.8313290963 | 5.99328 | 1 | — |
| 20 | succeeded | -1.8256749963 | 7.70235 | 4 | — |
| 21 | succeeded | -1.8292088088 | 7.06486 | 3 | — |
| 22 | succeeded | -1.8330222853 | 8.02533 | 4 | — |
| 23 | succeeded | -1.8266635950 | 6.65779 | 3 | — |
| 24 | succeeded | -1.8391013117 | 11.3158 | 7 | — |
| 25 | succeeded | -1.8325995311 | 10.3847 | 7 | — |