Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.85478
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8547801439hartree
Shots256
Runtime executionsingle-job
Resilience0
MappingPT
Active space2e,2o
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_pittsburgh
- Resource type
- ibm quantum hardware
- Processor family
- Heron r3
- Processor model
- —
- Processor revision
- —
- Qubits
- —
- Connectivity
- —
- Runtime execution
- single-job
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2026-03-03T13:43:12+01:00
- Wall time (s)
- 238
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 | -1.8149239521 | 8.07871 | 2 | — |
| 2 | succeeded | -0.5444777700 | 8.4264 | 1 | — |
| 3 | succeeded | -0.9238487645 | 8.41502 | 1 | — |
| 4 | succeeded | -1.3363982251 | 8.67987 | 1 | — |
| 5 | succeeded | -1.8061826876 | 8.829 | 1 | — |
| 6 | succeeded | -1.7713908577 | 8.81167 | 1 | — |
| 7 | succeeded | -1.8502620771 | 13.4032 | 5 | — |
| 8 | succeeded | -1.7527722955 | 8.68649 | 1 | — |
| 9 | succeeded | -1.7988115049 | 9.70259 | 1 | — |
| 10 | succeeded | -1.8324586130 | 9.97564 | 1 | — |
| 11 | succeeded | -1.8547801439 | 8.87837 | 1 | — |
| 12 | succeeded | -1.8146377717 | 10.7028 | 1 | — |
| 13 | succeeded | -1.8502620771 | 16.1188 | 4 | — |
| 14 | succeeded | -1.8273594967 | 18.7276 | 1 | — |
| 15 | succeeded | -1.8228414299 | 8.33124 | 2 | — |
| 16 | succeeded | -1.8121055908 | 8.20018 | 1 | — |
| 17 | succeeded | -1.8126692631 | 8.96377 | 1 | — |
| 18 | succeeded | -1.7889255186 | 11.1631 | 1 | — |
| 19 | succeeded | -1.8180371826 | 10.6485 | 1 | — |
| 20 | succeeded | -1.8188870353 | 11.2672 | 1 | — |
| 21 | succeeded | -1.8335859576 | 10.4236 | 1 | — |
| 22 | succeeded | -1.8378265326 | 10.4014 | 1 | — |
| 23 | succeeded | -1.8092785408 | 10.2685 | 1 | — |