Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -0.939365
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-0.9393650332hartree
Shots512
Runtime executionsingle-job
Resilience1
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
- 512
- Precision
- 0.0441942
- Resilience
- 1
- Submitted
- 2026-03-02T22:48:36+01:00
- Wall time (s)
- 369
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)
- 0.91791
- Signed error (Ha)
- 0.91791
- Total QPU time (s)
- 227
- 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
21 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 | -0.8439698752 | 15.5231 | 10 | — |
| 2 | succeeded | -0.8221377133 | 15.2979 | 10 | — |
| 3 | succeeded | -0.7888486304 | 14.9996 | 10 | — |
| 4 | succeeded | -0.7512624424 | 15.3342 | 10 | — |
| 5 | succeeded | -0.8452789414 | 15.3691 | 10 | — |
| 6 | succeeded | -0.9281031481 | 15.133 | 10 | — |
| 7 | succeeded | -0.7836688989 | 16.7246 | 10 | — |
| 8 | succeeded | -0.7595671653 | 15.4866 | 11 | — |
| 9 | succeeded | -0.8479761323 | 20.2675 | 15 | — |
| 10 | succeeded | -0.8696843618 | 16.3436 | 11 | — |
| 11 | succeeded | -0.7912447547 | 15.2187 | 10 | — |
| 12 | succeeded | -0.8148584426 | 15.3231 | 10 | — |
| 13 | succeeded | -0.7567261857 | 15.5272 | 10 | — |
| 14 | succeeded | -0.9393650332 | 15.4963 | 10 | — |
| 15 | succeeded | -0.8882685938 | 35.3436 | 11 | — |
| 16 | succeeded | -0.8691765112 | 15.9531 | 10 | — |
| 17 | succeeded | -0.8154132187 | 20.6217 | 12 | — |
| 18 | succeeded | -0.9298478955 | 17.3741 | 12 | — |
| 19 | succeeded | -0.9032260337 | 20.3306 | 12 | — |
| 20 | succeeded | -0.7997736250 | 15.9019 | 11 | — |
| 21 | succeeded | -0.8541647172 | 20.3846 | 12 | — |