Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.04019
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.0034008204hartree
Shots256
Runtime executionsingle-job
Resilience0
MappingJW
Active space2e,2o
Jordan-Wigner mapping · 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
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2026-02-15T23:26:20+01:00
- Wall time (s)
- 103
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
- 4
- Physical qubits
- Not recorded
- Parameters
- Not recorded
- Depth
- 96
- Two-qubit gates
- 48
- 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)
- 0.853874
- Signed error (Ha)
- 0.853874
- Total QPU time (s)
- 21
- 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 | -1.0174964154 | 5.28452 | 1 | — |
| 2 | succeeded | -0.9086761776 | 5.8659 | 2 | — |
| 3 | succeeded | -0.9122985290 | 4.65708 | 1 | — |
| 4 | succeeded | -0.9982247561 | 4.96902 | 1 | — |
| 5 | succeeded | -1.0171746680 | 6.21725 | 1 | — |
| 6 | succeeded | -0.9371801772 | 5.28604 | 1 | — |
| 7 | succeeded | -0.9890017359 | 5.25759 | 1 | — |
| 8 | succeeded | -0.9880892853 | 5.0018 | 1 | — |
| 9 | succeeded | -1.0196715150 | 4.9993 | 1 | — |
| 10 | succeeded | -0.9719915384 | 5.04198 | 1 | — |
| 11 | succeeded | -0.9137290172 | 4.65986 | 1 | — |
| 12 | succeeded | -1.0210459513 | 4.90243 | 1 | — |
| 13 | succeeded | -1.0301654407 | 4.76506 | 1 | — |
| 14 | succeeded | -1.0091791494 | 4.93408 | 1 | — |
| 15 | succeeded | -1.0025119839 | 5.00068 | 1 | — |
| 16 | succeeded | -0.9183414611 | 5.09367 | 1 | — |
| 17 | succeeded | -1.0401888921 | 5.0518 | 1 | — |
| 18 | succeeded | -0.9811796359 | 5.10394 | 1 | — |
| 19 | succeeded | -1.0385465539 | 5.12015 | 1 | — |
| 20 | succeeded | -1.0034008204 | 5.27524 | 1 | — |