Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.85309
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8530891271hartree
Shots256
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
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2026-03-06T23:39:49+01:00
- Wall time (s)
- 106
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
22 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 | -1.7959844549 | 4.21016 | 1 | — |
| 2 | succeeded | -0.5574769868 | 4.53301 | 1 | — |
| 3 | succeeded | -0.8071246165 | 8.8954 | 6 | — |
| 4 | succeeded | -1.3284807474 | 6.66259 | 3 | — |
| 5 | succeeded | -1.7798980736 | 6.1384 | 3 | — |
| 6 | succeeded | -1.7583916409 | 4.57447 | 1 | — |
| 7 | succeeded | -1.8471575353 | 4.24335 | 1 | — |
| 8 | succeeded | -1.7440049650 | 4.17586 | 1 | — |
| 9 | succeeded | -1.8183146744 | 4.27764 | 1 | — |
| 10 | succeeded | -1.8047604740 | 4.15287 | 1 | — |
| 11 | succeeded | -1.8530891271 | 4.24639 | 1 | — |
| 12 | succeeded | -1.8262321521 | 4.29086 | 1 | — |
| 13 | succeeded | -1.8084286881 | 4.81029 | 1 | — |
| 14 | succeeded | -1.8225639381 | 4.51397 | 1 | — |
| 15 | succeeded | -1.8112557381 | 4.98917 | 1 | — |
| 16 | succeeded | -1.8482848798 | 4.3495 | 1 | — |
| 17 | succeeded | -1.8279318576 | 4.21806 | 1 | — |
| 18 | succeeded | -1.8186008549 | 4.20771 | 1 | — |
| 19 | succeeded | -1.8089923603 | 4.55595 | 1 | — |
| 20 | succeeded | -1.8381040244 | 4.10081 | 1 | — |
| 21 | succeeded | -1.8332997771 | 4.49129 | 1 | — |
| 22 | succeeded | -1.8516756021 | 4.30491 | 1 | — |