Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.20201
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.2020148658hartree
Shots64
Runtime executionsingle-job
Resilience2
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
- 64
- Precision
- 0.125
- Resilience
- 2
- Submitted
- 2026-03-03T12:50:42+01:00
- Wall time (s)
- 410
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)
- 0.65526
- Signed error (Ha)
- 0.65526
- Total QPU time (s)
- 245
- 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
24 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 | -0.6531652228 | 17.2057 | 10 | — |
| 2 | succeeded | -0.8955199191 | 16.7177 | 10 | — |
| 3 | succeeded | -0.6561320774 | 16.2613 | 10 | — |
| 4 | succeeded | -0.8690478310 | 16.9574 | 10 | — |
| 5 | succeeded | -1.0403249062 | 17.9771 | 11 | — |
| 6 | succeeded | -0.7996387735 | 18.268 | 11 | — |
| 7 | succeeded | -0.7805610849 | 17.4288 | 10 | — |
| 8 | succeeded | -0.8148567827 | 16.5075 | 10 | — |
| 9 | succeeded | -0.8406204280 | 17.0043 | 10 | — |
| 10 | succeeded | -1.2020148658 | 16.0363 | 10 | — |
| 11 | succeeded | -0.8662304670 | 16.6203 | 10 | — |
| 12 | succeeded | -0.9900924877 | 17.0559 | 10 | — |
| 13 | succeeded | -0.8061061859 | 16.721 | 10 | — |
| 14 | succeeded | -0.7861990208 | 17.3348 | 10 | — |
| 15 | succeeded | -0.6979310515 | 17.0167 | 10 | — |
| 16 | succeeded | -0.8224491184 | 20.5129 | 13 | — |
| 17 | succeeded | -1.0128642679 | 17.9917 | 10 | — |
| 18 | succeeded | -0.8193540504 | 16.4221 | 10 | — |
| 19 | succeeded | -0.9139653615 | 16.203 | 10 | — |
| 20 | succeeded | -1.0026356390 | 16.5515 | 10 | — |
| 21 | succeeded | -0.7832657031 | 17.151 | 10 | — |
| 22 | succeeded | -0.8162992245 | 16.8795 | 10 | — |
| 23 | succeeded | -0.7113940086 | 16.9556 | 10 | — |
| 24 | succeeded | -0.8971159571 | 16.7946 | 10 | — |