Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.86765
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8374059505hartree
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
- 2026-02-15T23:14:31+01:00
- Wall time (s)
- 87
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)
- 0.0198691
- Signed error (Ha)
- 0.0198691
- Total QPU time (s)
- 19
- 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
18 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 | -1.7948571104 | 5.10163 | 1 | — |
| 2 | succeeded | -0.5798028619 | 4.8028 | 1 | — |
| 3 | succeeded | -0.8742453323 | 5.04772 | 1 | — |
| 4 | succeeded | -1.6395949929 | 4.65653 | 1 | — |
| 5 | succeeded | -1.6648301878 | 4.55425 | 1 | — |
| 6 | succeeded | -1.8676493034 | 4.85218 | 1 | — |
| 7 | succeeded | -1.7852703374 | 4.7245 | 1 | — |
| 8 | succeeded | -1.8126822960 | 4.72206 | 1 | — |
| 9 | succeeded | -1.8263752424 | 4.82706 | 1 | — |
| 10 | succeeded | -1.8337290478 | 4.67928 | 1 | — |
| 11 | succeeded | -1.8183277074 | 5.31183 | 2 | — |
| 12 | succeeded | -1.8564841937 | 4.6909 | 1 | — |
| 13 | succeeded | -1.8241162090 | 4.66907 | 1 | — |
| 14 | succeeded | -1.8342927201 | 5.0393 | 1 | — |
| 15 | succeeded | -1.8365560978 | 5.1613 | 1 | — |
| 16 | succeeded | -1.8170572726 | 4.70062 | 1 | — |
| 17 | succeeded | -1.8612884410 | 4.74753 | 1 | — |
| 18 | succeeded | -1.8374059505 | 4.77828 | 1 | — |