Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.87373
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_fez
Final energy-1.8737283298hartree
Shots256
Runtime executionsession
Resilience0
MappingPT
Active space2e,2o
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_fez
- Resource type
- ibm quantum hardware
- Processor family
- Heron r2
- Processor model
- —
- Processor revision
- —
- Qubits
- —
- Connectivity
- —
- Runtime execution
- session
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2026-04-01T00:26:25+02:00
- Wall time (s)
- 211
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
21 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 | -1.8273594967 | 13.4913 | 1 | — |
| 2 | succeeded | -0.6465029957 | 12.2919 | 1 | — |
| 3 | succeeded | -0.9699140399 | 16.253 | 1 | — |
| 4 | succeeded | -1.3183085806 | 11.0116 | 1 | — |
| 5 | succeeded | -1.8262495294 | 9.21707 | 1 | — |
| 6 | succeeded | -1.7637595604 | 7.83295 | 1 | — |
| 7 | succeeded | -1.8683517216 | 8.38586 | 1 | — |
| 8 | succeeded | -1.8262495294 | 9.39961 | 1 | — |
| 9 | succeeded | -1.8304727271 | 9.23684 | 1 | — |
| 10 | succeeded | -1.8047604740 | 8.77944 | 1 | — |
| 11 | succeeded | -1.8341496299 | 8.16602 | 1 | — |
| 12 | succeeded | -1.8737283298 | 8.99711 | 1 | — |
| 13 | succeeded | -1.8494122244 | 8.79196 | 1 | — |
| 14 | succeeded | -1.8287817103 | 11.6192 | 1 | — |
| 15 | succeeded | -1.8451716494 | 9.68238 | 1 | — |
| 16 | succeeded | -1.8443304853 | 12.4583 | 1 | — |
| 17 | succeeded | -1.8330222853 | 11.7203 | 1 | — |
| 18 | succeeded | -1.8352856630 | 9.53318 | 1 | — |
| 19 | succeeded | -1.8191732158 | 7.99216 | 1 | — |
| 20 | succeeded | -1.8188870353 | 8.17276 | 1 | — |
| 21 | succeeded | -1.8197368881 | 8.5512 | 1 | — |