Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.84985
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8498501837hartree
Shots512
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
- 512
- Precision
- 0.0441942
- Resilience
- 0
- Submitted
- 2026-03-06T23:41:35+01:00
- Wall time (s)
- 123
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 | -1.8245324467 | 4.3587 | 1 | — |
| 2 | succeeded | -0.5793779356 | 4.53777 | 1 | — |
| 3 | succeeded | -0.9365661451 | 4.12066 | 1 | — |
| 4 | succeeded | -1.2877833915 | 4.10474 | 1 | — |
| 5 | succeeded | -1.7960105208 | 4.50196 | 1 | — |
| 6 | succeeded | -1.7531581229 | 4.24807 | 1 | — |
| 7 | succeeded | -1.8354244089 | 4.67782 | 1 | — |
| 8 | succeeded | -1.8464551171 | 4.68291 | 1 | — |
| 9 | succeeded | -1.7252215910 | 5.12074 | 1 | — |
| 10 | succeeded | -1.8400899103 | 4.91992 | 1 | — |
| 11 | succeeded | -1.7745301541 | 4.95785 | 1 | — |
| 12 | succeeded | -1.8015128420 | 4.67708 | 1 | — |
| 13 | succeeded | -1.7977015376 | 4.39447 | 1 | — |
| 14 | succeeded | -1.8487184948 | 4.83054 | 1 | — |
| 15 | succeeded | -1.8108395004 | 4.65488 | 1 | — |
| 16 | succeeded | -1.8293540712 | 4.84536 | 1 | — |
| 17 | succeeded | -1.8498501837 | 4.80526 | 1 | — |
| 18 | succeeded | -1.8248316601 | 11.0352 | 7 | — |
| 19 | succeeded | -1.8149413294 | 6.32136 | 3 | — |
| 20 | succeeded | -1.7828595252 | 5.87678 | 2 | — |
| 21 | succeeded | -1.7968516849 | 5.15917 | 1 | — |
| 22 | succeeded | -1.8420757962 | 4.56294 | 1 | — |
| 23 | succeeded | -1.8149456738 | 4.92737 | 1 | — |
| 24 | succeeded | -1.8081555406 | 4.41497 | 1 | — |