Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 25
- Best energy (Ha)
- -1.87719
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_torino
Final energy-1.8488711037hartree
Shots1024
Runtime executionsingle-job
Resilience2
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
- 1024
- Precision
- 0.03125
- Resilience
- 2
- Submitted
- 2025-11-10T17:02:57+01:00
- Wall time (s)
- 441
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)
- 0.00840393
- Signed error (Ha)
- 0.00840393
- Total QPU time (s)
- 228
- 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 | -1.8229788418 | 25.1487 | 12 | — |
| 2 | succeeded | -0.6212135212 | 25.3984 | 12 | — |
| 3 | succeeded | -0.8344362377 | 25.2975 | 12 | — |
| 4 | succeeded | -1.6566943771 | 24.3417 | 12 | — |
| 5 | succeeded | -1.6439431466 | 24.2458 | 12 | — |
| 6 | succeeded | -1.8614598235 | 24.5929 | 12 | — |
| 7 | succeeded | -1.8360787455 | 25.0466 | 12 | — |
| 8 | succeeded | -1.8771912204 | 27.1337 | 12 | — |
| 9 | succeeded | -1.8478580195 | 24.8959 | 12 | — |
| 10 | succeeded | -1.8234444404 | 24.9153 | 12 | — |
| 11 | succeeded | -1.8295929601 | 25.5168 | 12 | — |
| 12 | succeeded | -1.8258348820 | 24.7288 | 12 | — |
| 13 | succeeded | -1.8766698860 | 25.4191 | 12 | — |
| 14 | succeeded | -1.8473009616 | 18.8961 | 12 | — |
| 15 | succeeded | -1.8495862816 | 18.8159 | 12 | — |
| 16 | succeeded | -1.8375155370 | 18.3316 | 12 | — |
| 17 | succeeded | -1.8072558938 | 18.683 | 12 | — |
| 18 | succeeded | -1.8511357636 | 19.3589 | 12 | — |
| 19 | succeeded | -1.8488711037 | 19.2166 | 12 | — |