Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.6769
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.6769049395hartree
Shots16
Runtime executionsingle-job
Resilience1
MappingJW
Active space2e,2o
Jordan-Wigner mapping · 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
- 16
- Precision
- 0.25
- Resilience
- 1
- Submitted
- 2026-03-03T14:33:01+01:00
- Wall time (s)
- 1215
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
- 4
- Physical qubits
- Not recorded
- Parameters
- Not recorded
- Depth
- 96
- Two-qubit gates
- 48
- 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)
- 0.18037
- Signed error (Ha)
- 0.18037
- Total QPU time (s)
- 294
- 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
22 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 | -1.6368294473 | 49.0878 | 14 | — |
| 2 | succeeded | -0.8621827701 | 38.1951 | 14 | — |
| 3 | succeeded | -0.8249513040 | 55.0155 | 14 | — |
| 4 | succeeded | -1.1984590744 | 20.4128 | 11 | — |
| 5 | succeeded | -1.5078223594 | 20.5148 | 11 | — |
| 6 | succeeded | -1.2797326812 | 18.6225 | 10 | — |
| 7 | succeeded | -1.5568524234 | 20.8307 | 10 | — |
| 8 | succeeded | -1.4354245173 | 20.3897 | 11 | — |
| 9 | succeeded | -1.4685516541 | 33.159 | 17 | — |
| 10 | succeeded | -1.5318029490 | 29.3653 | 11 | — |
| 11 | succeeded | -1.5636887616 | 56.8901 | 14 | — |
| 12 | succeeded | -1.4904443755 | 69.9398 | 17 | — |
| 13 | succeeded | -1.5609032795 | 53.1563 | 17 | — |
| 14 | succeeded | -1.3965714887 | 168.291 | 22 | — |
| 15 | succeeded | -1.6460063751 | 22.1701 | 11 | — |
| 16 | succeeded | -1.6769049395 | 20.9447 | 10 | — |
| 17 | succeeded | -1.5601450600 | 21.2071 | 11 | — |
| 18 | succeeded | -1.5452080882 | 20.3067 | 10 | — |
| 19 | succeeded | -1.6220195706 | 127.903 | 14 | — |
| 20 | succeeded | -1.4647128049 | 167.529 | 14 | — |
| 21 | succeeded | -1.5952326496 | 68.1994 | 17 | — |
| 22 | succeeded | -1.5448004090 | 111.681 | 14 | — |