Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.67853
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_torino
Final energy-1.6696995318hartree
Shots2048
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_torino
- Resource type
- ibm quantum hardware
- Processor family
- Heron r1
- Processor model
- Not recorded
- Processor revision
- Not recorded
- Qubits
- Not recorded
- Connectivity
- Not recorded
- Runtime execution
- single-job
- Shots
- 2048
- Precision
- 0.0220971
- Resilience
- 0
- Submitted
- 2025-10-01T12:46:03+02:00
- Wall time (s)
- 343
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)
- 0.187575
- Signed error (Ha)
- 0.187575
- Total QPU time (s)
- 60
- 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 | -1.6119639866 | 37.543 | 2 | — |
| 2 | succeeded | -0.6652712327 | 7.05356 | 3 | — |
| 3 | succeeded | -0.8886840719 | 41.8048 | 5 | — |
| 4 | succeeded | -1.4895478619 | 6.76657 | 3 | — |
| 5 | succeeded | -1.4920029992 | 6.57128 | 3 | — |
| 6 | succeeded | -1.6572282147 | 43.6277 | 4 | — |
| 7 | succeeded | -1.6399613390 | 6.80029 | 3 | — |
| 8 | succeeded | -1.6310530905 | 7.38439 | 3 | — |
| 9 | succeeded | -1.6785297187 | 44.0538 | 4 | — |
| 10 | succeeded | -1.6676464451 | 6.97749 | 3 | — |
| 11 | succeeded | -1.6275821345 | 6.80437 | 3 | — |
| 12 | succeeded | -1.6427775282 | 6.3853 | 3 | — |
| 13 | succeeded | -1.6563425894 | 41.7888 | 4 | — |
| 14 | succeeded | -1.6669418548 | 6.47589 | 3 | — |
| 15 | succeeded | -1.6510071842 | 6.66092 | 3 | — |
| 16 | succeeded | -1.6625256752 | 6.49307 | 2 | — |
| 17 | succeeded | -1.6589214037 | 45.0465 | 4 | — |
| 18 | succeeded | -1.6686372159 | 6.83867 | 3 | — |
| 19 | succeeded | -1.6696995318 | 6.90818 | 2 | — |