Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.87203
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.7872345017hartree
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_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
- session
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2025-12-30T16:05:46+01:00
- Wall time (s)
- 111
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)
- 0.0700405
- Signed error (Ha)
- 0.0700405
- Total QPU time (s)
- 25
- 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 | -1.8118107217 | 6.99602 | 1 | — |
| 2 | succeeded | -0.6691193957 | 5.50368 | 1 | — |
| 3 | succeeded | -0.9204580422 | 5.32872 | 1 | — |
| 4 | succeeded | -1.5662565049 | 9.2131 | 3 | — |
| 5 | succeeded | -1.6518222824 | 9.30999 | 4 | — |
| 6 | succeeded | -1.8618564575 | 5.03879 | 1 | — |
| 7 | succeeded | -1.7844248290 | 5.24063 | 1 | — |
| 8 | succeeded | -1.8106833772 | 5.29005 | 1 | — |
| 9 | succeeded | -1.8513981103 | 5.15762 | 1 | — |
| 10 | succeeded | -1.8183233631 | 4.66295 | 1 | — |
| 11 | succeeded | -1.8672243771 | 4.90297 | 1 | — |
| 12 | succeeded | -1.8406535826 | 4.96859 | 1 | — |
| 13 | succeeded | -1.8559161771 | 5.33518 | 1 | — |
| 14 | succeeded | -1.8290678908 | 4.93917 | 1 | — |
| 15 | succeeded | -1.8115419185 | 5.00457 | 1 | — |
| 16 | succeeded | -1.8409397630 | 5.03525 | 1 | — |
| 17 | succeeded | -1.8163461658 | 5.1332 | 1 | — |
| 18 | succeeded | -1.8265270212 | 4.83897 | 1 | — |
| 19 | succeeded | -1.8720286243 | 4.78929 | 1 | — |
| 20 | succeeded | -1.7872345017 | 5.00173 | 1 | — |