Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.84362
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8436150342hartree
Shots512
Runtime executionsession
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
- session
- Shots
- 512
- Precision
- 0.0441942
- Resilience
- 0
- Submitted
- 2026-04-01T00:01:25+02:00
- Wall time (s)
- 108
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
24 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 | -1.8191645271 | 6.08687 | 1 | — |
| 2 | succeeded | -0.5659537924 | 4.25332 | 1 | — |
| 3 | succeeded | -0.8992595116 | 4.50351 | 1 | — |
| 4 | succeeded | -1.3803432130 | 4.5986 | 1 | — |
| 5 | succeeded | -1.7892247320 | 4.26085 | 1 | — |
| 6 | succeeded | -1.7650299952 | 5.0877 | 1 | — |
| 7 | succeeded | -1.8157781492 | 4.34096 | 1 | — |
| 8 | succeeded | -1.7774698840 | 4.5695 | 1 | — |
| 9 | succeeded | -1.8270820049 | 4.40734 | 1 | — |
| 10 | succeeded | -1.8390969673 | 4.57378 | 1 | — |
| 11 | succeeded | -1.8061696547 | 4.18385 | 1 | — |
| 12 | succeeded | -1.8376790980 | 4.7438 | 1 | — |
| 13 | succeeded | -1.8144990258 | 4.44543 | 1 | — |
| 14 | succeeded | -1.8007930465 | 4.21918 | 1 | — |
| 15 | succeeded | -1.8167624035 | 4.17896 | 1 | — |
| 16 | succeeded | -1.8347133021 | 4.29451 | 1 | — |
| 17 | succeeded | -1.8214279049 | 4.53261 | 1 | — |
| 18 | succeeded | -1.8013567188 | 4.81136 | 1 | — |
| 19 | succeeded | -1.8279275133 | 4.49574 | 1 | — |
| 20 | succeeded | -1.8436150342 | 4.20154 | 1 | — |
| 21 | succeeded | -1.8290548578 | 4.28353 | 1 | — |
| 22 | succeeded | -1.8373972619 | 4.57061 | 1 | — |
| 23 | succeeded | -1.8108308117 | 4.42272 | 1 | — |
| 24 | succeeded | -1.8344314660 | 4.45426 | 1 | — |