Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.91047
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8302039240hartree
Shots64
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
- 64
- Precision
- 0.125
- Resilience
- 0
- Submitted
- 2026-02-15T23:09:48+01:00
- Wall time (s)
- 137
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
19 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 | -1.7985340131 | 4.84942 | 1 | — |
| 2 | succeeded | -0.5707623840 | 4.8179 | 1 | — |
| 3 | succeeded | -0.8591214837 | 4.66128 | 1 | — |
| 4 | succeeded | -1.6606504333 | 4.52583 | 1 | — |
| 5 | succeeded | -1.6391092460 | 4.91123 | 1 | — |
| 6 | succeeded | -1.8516756021 | 4.75418 | 1 | — |
| 7 | succeeded | -1.7974240458 | 4.94957 | 1 | — |
| 8 | succeeded | -1.8053328349 | 4.92684 | 1 | — |
| 9 | succeeded | -1.7465371459 | 5.10744 | 1 | — |
| 10 | succeeded | -1.8075875240 | 4.54896 | 1 | — |
| 11 | succeeded | -1.7906252240 | 5.15737 | 1 | — |
| 12 | succeeded | -1.8460215021 | 5.00318 | 1 | — |
| 13 | succeeded | -1.9104712911 | 5.21198 | 1 | — |
| 14 | succeeded | -1.8550750130 | 5.12337 | 1 | — |
| 15 | succeeded | -1.7736629240 | 46.6631 | 2 | — |
| 16 | succeeded | -1.8708925912 | 5.43638 | 1 | — |
| 17 | succeeded | -1.8324586130 | 5.29754 | 1 | — |
| 18 | succeeded | -1.8460215021 | 5.09742 | 1 | — |
| 19 | succeeded | -1.8302039240 | 5.12286 | 1 | — |