Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.8644
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.8375403521hartree
Shots256
Runtime executionsession
Resilience0
MappingPT
Active space2e,2o
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_aachen
- Resource type
- ibm quantum hardware
- Processor family
- Heron r2
- Processor model
- —
- Processor revision
- —
- Qubits
- —
- Connectivity
- —
- Runtime execution
- session
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2025-09-26T20:17:00+02:00
- Wall time (s)
- 112
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 | -1.8058791299 | 31.9039 | 8 | — |
| 2 | succeeded | -0.4924722141 | 5.29717 | 2 | — |
| 3 | succeeded | -0.8718432086 | 5.03569 | 2 | — |
| 4 | succeeded | -1.5820827716 | 5.01399 | 2 | — |
| 5 | succeeded | -1.6761383878 | 5.5041 | 2 | — |
| 6 | succeeded | -1.8375490408 | 5.07055 | 2 | — |
| 7 | succeeded | -1.7835749763 | 5.54876 | 2 | — |
| 8 | succeeded | -1.8075875240 | 5.47849 | 2 | — |
| 9 | succeeded | -1.8502620771 | 5.1302 | 2 | — |
| 10 | succeeded | -1.8335859576 | 5.13817 | 2 | — |
| 11 | succeeded | -1.8643973271 | 5.08179 | 2 | — |
| 12 | succeeded | -1.8157738049 | 5.21201 | 2 | — |
| 13 | succeeded | -1.8389538771 | 5.28297 | 2 | — |
| 14 | succeeded | -1.8516756021 | 5.16926 | 2 | — |
| 15 | succeeded | -1.8327361049 | 4.99159 | 2 | — |
| 16 | succeeded | -1.8166236576 | 5.72833 | 2 | — |
| 17 | succeeded | -1.8327361049 | 4.99871 | 2 | — |
| 18 | succeeded | -1.8431944521 | 4.93167 | 2 | — |
| 19 | succeeded | -1.8146464603 | 5.88651 | 2 | — |
| 20 | succeeded | -1.8375403521 | 5.31808 | 2 | — |