Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 25
- Best energy (Ha)
- -1.87289
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_fez
Final energy-1.8027919654hartree
Shots256
Runtime executionsession
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_fez
- Resource type
- ibm quantum hardware
- Processor family
- Heron r2
- Processor model
- Not recorded
- Processor revision
- Not recorded
- Qubits
- Not recorded
- Connectivity
- Not recorded
- Runtime execution
- session
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2025-11-20T12:48:52+01:00
- Wall time (s)
- 135
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)
- 0.0544831
- Signed error (Ha)
- 0.0544831
- Total QPU time (s)
- 22
- 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 | -1.8316000717 | 14.0819 | 2 | — |
| 2 | succeeded | -0.5843252731 | 6.49554 | 1 | — |
| 3 | succeeded | -0.8865421309 | 6.70122 | 1 | — |
| 4 | succeeded | -1.5916912662 | 5.86839 | 1 | — |
| 5 | succeeded | -1.6707617796 | 6.30463 | 1 | — |
| 6 | succeeded | -1.8471575353 | 7.12898 | 2 | — |
| 7 | succeeded | -1.7626582818 | 6.15507 | 1 | — |
| 8 | succeeded | -1.8482935685 | 6.12216 | 1 | — |
| 9 | succeeded | -1.8728871657 | 6.26234 | 1 | — |
| 10 | succeeded | -1.7298784037 | 7.69342 | 1 | — |
| 11 | succeeded | -1.7965828818 | 6.10509 | 1 | — |
| 12 | succeeded | -1.8112731154 | 6.63571 | 1 | — |
| 13 | succeeded | -1.8090184263 | 6.90129 | 1 | — |
| 14 | succeeded | -1.7603949041 | 6.68256 | 1 | — |
| 15 | succeeded | -1.7895152568 | 5.82922 | 1 | — |
| 16 | succeeded | -1.8494296017 | 5.91769 | 1 | — |
| 17 | succeeded | -1.8406709599 | 6.49079 | 1 | — |
| 18 | succeeded | -1.7982738986 | 6.39145 | 1 | — |
| 19 | succeeded | -1.7951606681 | 6.37133 | 1 | — |
| 20 | succeeded | -1.8027919654 | 6.51673 | 1 | — |