Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.8454
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8306353668hartree
Shots1024
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_pittsburgh
- Resource type
- quantum processor
- Processor family
- Heron
- Processor model
- ibm_pittsburgh
- Processor revision
- 3
- Qubits
- 156
- Connectivity
- Not recorded
- Runtime execution
- single-job
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2026-02-11T14:36:43+01:00
- Wall time (s)
- 140
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)
- 0.0266397
- Signed error (Ha)
- 0.0266397
- Total QPU time (s)
- 38
- 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
19 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 | -1.8250961189 | 15.7411 | 2 | — |
| 2 | succeeded | -0.6016366100 | 7.39354 | 2 | — |
| 3 | succeeded | -0.8491639522 | 7.34041 | 2 | — |
| 4 | succeeded | -1.6062449260 | 7.0977 | 2 | — |
| 5 | succeeded | -1.6419319517 | 7.23497 | 2 | — |
| 6 | succeeded | -1.8392422297 | 7.58965 | 2 | — |
| 7 | succeeded | -1.8454014899 | 7.8749 | 2 | — |
| 8 | succeeded | -1.7344095034 | 7.33246 | 2 | — |
| 9 | succeeded | -1.7459908509 | 7.40421 | 2 | — |
| 10 | succeeded | -1.8391078282 | 7.37365 | 2 | — |
| 11 | succeeded | -1.8162204529 | 7.02132 | 2 | — |
| 12 | succeeded | -1.8013068953 | 6.84714 | 2 | — |
| 13 | succeeded | -1.7916290278 | 7.11757 | 2 | — |
| 14 | succeeded | -1.7990500340 | 7.48829 | 2 | — |
| 15 | succeeded | -1.8344466711 | 6.57864 | 2 | — |
| 16 | succeeded | -1.7931834708 | 7.37789 | 2 | — |
| 17 | succeeded | -1.8042076625 | 7.80153 | 2 | — |
| 18 | succeeded | -1.8167841251 | 7.3228 | 2 | — |
| 19 | succeeded | -1.8306353668 | 7.02379 | 2 | — |