Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.83925
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8392465741hartree
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
- 2026-03-03T13:51:58+01:00
- Wall time (s)
- 212
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)
- 0.0180285
- Signed error (Ha)
- 0.0180285
- Total QPU time (s)
- 46
- 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
20 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 | -1.8096254056 | 8.14426 | 2 | — |
| 2 | succeeded | -0.5580428312 | 21.5043 | 5 | — |
| 3 | succeeded | -0.8795460510 | 7.88737 | 2 | — |
| 4 | succeeded | -1.3031890763 | 8.22414 | 2 | — |
| 5 | succeeded | -1.8174908876 | 9.82867 | 2 | — |
| 6 | succeeded | -1.7393524966 | 9.15591 | 2 | — |
| 7 | succeeded | -1.8321767769 | 8.43248 | 2 | — |
| 8 | succeeded | -1.8278603125 | 17.3726 | 5 | — |
| 9 | succeeded | -1.8280120914 | 8.98488 | 2 | — |
| 10 | succeeded | -1.8248273158 | 8.90289 | 2 | — |
| 11 | succeeded | -1.8392465741 | 9.46743 | 2 | — |
| 12 | succeeded | -1.8175515719 | 9.47026 | 2 | — |
| 13 | succeeded | -1.8253931602 | 10.4805 | 2 | — |
| 14 | succeeded | -1.8299871165 | 8.56264 | 2 | — |
| 15 | succeeded | -1.8253953324 | 8.71274 | 2 | — |
| 16 | succeeded | -1.8367707332 | 20.197 | 2 | — |
| 17 | succeeded | -1.8359252247 | 8.49758 | 2 | — |
| 18 | succeeded | -1.8232728727 | 8.38083 | 2 | — |
| 19 | succeeded | -1.8097099837 | 8.99447 | 2 | — |
| 20 | succeeded | -1.8012982066 | 8.82634 | 2 | — |