Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.84871
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.8487054619hartree
Shots1024
Runtime executionsingle-job
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
- single-job
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2026-03-09T22:08:00+01:00
- Wall time (s)
- 134
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
23 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 | -1.8287036487 | 6.33558 | 3 | — |
| 2 | succeeded | -0.5429189826 | 6.20583 | 2 | — |
| 3 | succeeded | -0.9001787372 | 5.62166 | 2 | — |
| 4 | succeeded | -1.3409184641 | 5.86565 | 2 | — |
| 5 | succeeded | -1.8025101292 | 5.8721 | 2 | — |
| 6 | succeeded | -1.7644641507 | 5.7129 | 2 | — |
| 7 | succeeded | -1.8364130076 | 5.44545 | 2 | — |
| 8 | succeeded | -1.8434893212 | 6.18593 | 3 | — |
| 9 | succeeded | -1.7267803783 | 6.1931 | 2 | — |
| 10 | succeeded | -1.8487054619 | 5.56697 | 2 | — |
| 11 | succeeded | -1.8161943869 | 5.9887 | 2 | — |
| 12 | succeeded | -1.8354981262 | 5.62361 | 2 | — |
| 13 | succeeded | -1.8379631063 | 5.89831 | 2 | — |
| 14 | succeeded | -1.8293453826 | 6.3785 | 2 | — |
| 15 | succeeded | -1.8360574542 | 5.52596 | 2 | — |
| 16 | succeeded | -1.8434069153 | 5.55483 | 2 | — |
| 17 | succeeded | -1.8329507402 | 5.76774 | 2 | — |
| 18 | succeeded | -1.8416421812 | 5.44992 | 2 | — |
| 19 | succeeded | -1.8452431945 | 5.45239 | 2 | — |
| 20 | succeeded | -1.8422773986 | 5.22775 | 2 | — |
| 21 | succeeded | -1.8321702604 | 6.11591 | 3 | — |
| 22 | succeeded | -1.8448919854 | 5.91182 | 3 | — |
| 23 | succeeded | -1.8481417896 | 5.73036 | 2 | — |