Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.83966
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.7982478326hartree
Shots512
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_brussels
- Resource type
- ibm quantum hardware
- Processor family
- Eagle r3
- Processor model
- Not recorded
- Processor revision
- Not recorded
- Qubits
- Not recorded
- Connectivity
- Not recorded
- Runtime execution
- single-job
- Shots
- 512
- Precision
- 0.0441942
- Resilience
- 0
- Submitted
- 2026-02-15T22:52:49+01:00
- Wall time (s)
- 92
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)
- 0.0590272
- Signed error (Ha)
- 0.0590272
- 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
17 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 | -1.8396562953 | 5.3119 | 2 | — |
| 2 | succeeded | -0.6123052483 | 4.7519 | 1 | — |
| 3 | succeeded | -0.8927599032 | 9.61156 | 5 | — |
| 4 | succeeded | -1.6063858441 | 5.07048 | 1 | — |
| 5 | succeeded | -1.6355710892 | 5.75368 | 1 | — |
| 6 | succeeded | -1.8187526337 | 5.0535 | 1 | — |
| 7 | succeeded | -1.7866534522 | 4.79198 | 1 | — |
| 8 | succeeded | -1.8210029785 | 5.30282 | 1 | — |
| 9 | succeeded | -1.8098335244 | 5.32308 | 1 | — |
| 10 | succeeded | -1.8301865467 | 5.27378 | 1 | — |
| 11 | succeeded | -1.8046043508 | 5.0329 | 1 | — |
| 12 | succeeded | -1.7972592340 | 5.30068 | 1 | — |
| 13 | succeeded | -1.8140740994 | 4.8434 | 1 | — |
| 14 | succeeded | -1.8308933092 | 4.98239 | 1 | — |
| 15 | succeeded | -1.8173260758 | 5.01667 | 1 | — |
| 16 | succeeded | -1.8275025869 | 5.06316 | 1 | — |
| 17 | succeeded | -1.7982478326 | 5.0082 | 1 | — |