Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.87712
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.8474350271hartree
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
- 2025-09-26T20:01:12+02:00
- Wall time (s)
- 103
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 | -1.8152101326 | 86.1793 | 10 | — |
| 2 | succeeded | -0.5444777700 | 4.98497 | 2 | — |
| 3 | succeeded | -0.8803243586 | 5.13528 | 2 | — |
| 4 | succeeded | -1.6123217802 | 5.16419 | 2 | — |
| 5 | succeeded | -1.6515447906 | 4.99003 | 2 | — |
| 6 | succeeded | -1.8771190521 | 5.23585 | 2 | — |
| 7 | succeeded | -1.7864020263 | 5.60066 | 2 | — |
| 8 | succeeded | -1.8629924907 | 5.14248 | 2 | — |
| 9 | succeeded | -1.8488485521 | 5.00184 | 2 | — |
| 10 | succeeded | -1.8095647213 | 5.02676 | 2 | — |
| 11 | succeeded | -1.8533753076 | 5.26262 | 2 | — |
| 12 | succeeded | -1.8604429326 | 5.00375 | 2 | — |
| 13 | succeeded | -1.8262408408 | 5.21029 | 2 | — |
| 14 | succeeded | -1.8214365935 | 5.10612 | 2 | — |
| 15 | succeeded | -1.8285042185 | 5.29119 | 2 | — |
| 16 | succeeded | -1.8714649521 | 6.09286 | 2 | — |
| 17 | succeeded | -1.8245498240 | 5.58576 | 2 | — |
| 18 | succeeded | -1.8474350271 | 4.60416 | 2 | — |