Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.87204
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.8720373130hartree
Shots64
Runtime executionsingle-job
Resilience0
MappingPT
Active space2e,2o
Parity mapping with full symmetry tapering · Shots and precision · Resilience settings
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_aachen
- Resource type
- quantum processor
- Processor family
- Heron
- Processor model
- ibm_aachen
- Processor revision
- 3
- Qubits
- 156
- Connectivity
- Not recorded
- Runtime execution
- single-job
- Shots
- 64
- Precision
- 0.125
- Resilience
- 0
- Submitted
- 2026-03-09T21:59:34+01:00
- Wall time (s)
- 112
Molecular system
- Charge
- 0
- Multiplicity
- 1
- Basis
- STO-3G
- Active space
- 2e,2o
- Active electrons
- 2
- Spatial orbitals
- 2
- Active orbital indices
- Not recorded
- Geometry units
- angstrom
Circuit
- Logical qubits
- 1
- Physical qubits
- Not recorded
- Parameters
- Not recorded
- Depth
- 1
- Two-qubit gates
- 0
- Hamiltonian terms
- Not recorded
Scientific provenance
- Cohort
- published h2
- Reference method
- exact diagonalization
- Reference energy (Ha)
- -1.85728
- Energy convention
- Published H2 benchmark electronic-energy convention
- Absolute error (Ha)
- 0.0147623
- Signed error (Ha)
- -0.0147623
- Total QPU time (s)
- 32
- Calibration time
- Not recorded
- Mean readout error
- Not recorded
- Mean two-qubit gate error
- Not recorded
Software
- Qiskit
- 1.4.3
- Qiskit Aer
- 0.17.1
- Qiskit Algorithms
- 0.3.1
- Qiskit Ibm Runtime
- 0.40.1
- Qiskit Nature
- 0.7.2
- Qiskit Nature Pyscf
- 0.4.0
Molecular geometry (angstrom)
| Atom | x | y | z |
|---|---|---|---|
| H | 0 | 0 | 0 |
| H | 0 | 0 | 0.735 |
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
21 recorded objective evaluations. Charts use cumulative time so convergence cost remains comparable across calculations.
Download trajectory CSV · Download trajectory JSON
| Attempt | Outcome | Energy (Ha) | Elapsed (s) | Quantum (s) | Parameters |
|---|---|---|---|---|---|
| 1 | succeeded | -1.8482761912 | 5.37939 | 1 | — |
| 2 | succeeded | -0.6091963621 | 5.83215 | 2 | — |
| 3 | succeeded | -0.7743447384 | 5.41012 | 2 | — |
| 4 | succeeded | -1.4378510899 | 4.9401 | 1 | — |
| 5 | succeeded | -1.8720373130 | 5.13478 | 2 | — |
| 6 | succeeded | -1.5939459553 | 6.62411 | 2 | — |
| 7 | succeeded | -1.8324586130 | 4.98974 | 1 | — |
| 8 | succeeded | -1.8121316567 | 4.88514 | 1 | — |
| 9 | succeeded | -1.8211504131 | 5.09644 | 2 | — |
| 10 | succeeded | -1.8562197349 | 4.89241 | 1 | — |
| 11 | succeeded | -1.8222951349 | 5.49253 | 2 | — |
| 12 | succeeded | -1.8222951349 | 7.07293 | 4 | — |
| 13 | succeeded | -1.8415121240 | 5.00843 | 1 | — |
| 14 | succeeded | -1.8087322458 | 5.54221 | 2 | — |
| 15 | succeeded | -1.8222951349 | 4.88791 | 1 | — |
| 16 | succeeded | -1.8528203239 | 5.16573 | 1 | — |
| 17 | succeeded | -1.8313486458 | 4.98908 | 1 | — |
| 18 | succeeded | -1.7804617459 | 5.01274 | 1 | — |
| 19 | succeeded | -1.7035937896 | 4.66313 | 1 | — |
| 20 | succeeded | -1.7555906568 | 5.02017 | 1 | — |
| 21 | succeeded | -1.7284648787 | 5.66121 | 2 | — |