Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.85958
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8595843912hartree
Shots32
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
- 32
- Precision
- 0.176777
- Resilience
- 0
- Submitted
- 2026-03-06T23:33:25+01:00
- Wall time (s)
- 109
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
20 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 | -1.8595843912 | 4.91147 | 1 | — |
| 2 | succeeded | -0.5232748950 | 5.6628 | 1 | — |
| 3 | succeeded | -0.8127787165 | 5.22121 | 1 | — |
| 4 | succeeded | -1.2422817884 | 4.85684 | 1 | — |
| 5 | succeeded | -1.8437668130 | 5.27684 | 1 | — |
| 6 | succeeded | -1.7646094131 | 4.75672 | 1 | — |
| 7 | succeeded | -1.7487918350 | 5.00119 | 1 | — |
| 8 | succeeded | -1.6922508350 | 5.34928 | 1 | — |
| 9 | succeeded | -1.8256597912 | 5.15828 | 1 | — |
| 10 | succeeded | -1.7306848132 | 6.69877 | 3 | — |
| 11 | succeeded | -1.7985340131 | 8.20838 | 1 | — |
| 12 | succeeded | -1.8256597912 | 5.07146 | 1 | — |
| 13 | succeeded | -1.7985340131 | 5.79246 | 1 | — |
| 14 | succeeded | -1.8143515912 | 5.21122 | 1 | — |
| 15 | succeeded | -1.8369679912 | 4.63585 | 1 | — |
| 16 | succeeded | -1.7714082350 | 4.77394 | 1 | — |
| 17 | succeeded | -1.7646094131 | 4.37115 | 1 | — |
| 18 | succeeded | -1.8369679912 | 5.3084 | 1 | — |
| 19 | succeeded | -1.8369679912 | 5.03935 | 1 | — |
| 20 | succeeded | -1.8595843912 | 4.92858 | 1 | — |