Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.86001
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8464507728hartree
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
- 2026-02-12T21:14:18+01:00
- Wall time (s)
- 89
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
18 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 | -1.8026271535 | 4.84333 | 1 | — |
| 2 | succeeded | -0.5638335049 | 4.83624 | 1 | — |
| 3 | succeeded | -0.8506490223 | 4.92105 | 1 | — |
| 4 | succeeded | -1.5731766953 | 4.84588 | 1 | — |
| 5 | succeeded | -1.6638372449 | 4.79088 | 1 | — |
| 6 | succeeded | -1.8600136619 | 5.16838 | 1 | — |
| 7 | succeeded | -1.8159386167 | 4.72772 | 1 | — |
| 8 | succeeded | -1.8323242115 | 4.84685 | 1 | — |
| 9 | succeeded | -1.7845461977 | 4.99552 | 1 | — |
| 10 | succeeded | -1.8310450880 | 4.86043 | 1 | — |
| 11 | succeeded | -1.8458827562 | 5.49096 | 1 | — |
| 12 | succeeded | -1.8412259435 | 4.57151 | 1 | — |
| 13 | succeeded | -1.8426351242 | 4.71177 | 1 | — |
| 14 | succeeded | -1.8138052963 | 4.76969 | 1 | — |
| 15 | succeeded | -1.8427738701 | 5.35192 | 1 | — |
| 16 | succeeded | -1.8228501185 | 4.99222 | 1 | — |
| 17 | succeeded | -1.8309019978 | 4.84519 | 1 | — |
| 18 | succeeded | -1.8464507728 | 4.73925 | 1 | — |