Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.95005
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.9048171911hartree
Shots16
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
- 16
- Precision
- 0.25
- Resilience
- 0
- Submitted
- 2026-02-15T22:47:58+01:00
- Wall time (s)
- 101
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 | -1.8143515912 | 7.10976 | 2 | — |
| 2 | succeeded | -0.4622245169 | 5.70262 | 1 | — |
| 3 | succeeded | -0.7246025602 | 5.73429 | 1 | — |
| 4 | succeeded | -1.7284648787 | 5.13085 | 1 | — |
| 5 | succeeded | -1.6244016351 | 4.89454 | 1 | — |
| 6 | succeeded | -1.8822007911 | 5.03235 | 1 | — |
| 7 | succeeded | -1.7058484787 | 4.93274 | 1 | — |
| 8 | succeeded | -1.8279492349 | 4.6238 | 1 | — |
| 9 | succeeded | -1.8053328349 | 4.74841 | 1 | — |
| 10 | succeeded | -1.9274335911 | 4.7633 | 1 | — |
| 11 | succeeded | -1.8822007911 | 5.21068 | 1 | — |
| 12 | succeeded | -1.8279492349 | 5.04351 | 1 | — |
| 13 | succeeded | -1.9274335911 | 4.65555 | 1 | — |
| 14 | succeeded | -1.7827164349 | 5.12311 | 1 | — |
| 15 | succeeded | -1.8595843912 | 5.04538 | 1 | — |
| 16 | succeeded | -1.9500499911 | 4.69616 | 1 | — |
| 17 | succeeded | -1.8595843912 | 4.75105 | 1 | — |
| 18 | succeeded | -1.7601000350 | 4.89418 | 1 | — |
| 19 | succeeded | -1.8369679912 | 4.42977 | 1 | — |
| 20 | succeeded | -1.9048171911 | 4.61847 | 1 | — |