Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -0.906151
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-0.9061506034hartree
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
- 2026-02-26T23:16:51+01:00
- Wall time (s)
- 351
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)
- 0.951124
- Signed error (Ha)
- 0.951124
- Total QPU time (s)
- 243
- 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 | -0.8696806318 | 18.1151 | 12 | — |
| 2 | succeeded | -0.8455497091 | 15.7786 | 11 | — |
| 3 | succeeded | -0.8075054929 | 15.5134 | 11 | — |
| 4 | succeeded | -0.8293166199 | 16.2804 | 11 | — |
| 5 | succeeded | -0.8974706727 | 15.9752 | 11 | — |
| 6 | succeeded | -0.8362406793 | 16.0765 | 11 | — |
| 7 | succeeded | -0.8274178776 | 15.9641 | 11 | — |
| 8 | succeeded | -0.8318740348 | 16.0381 | 11 | — |
| 9 | succeeded | -0.8606077420 | 16.1841 | 11 | — |
| 10 | succeeded | -0.8087598820 | 17.6223 | 13 | — |
| 11 | succeeded | -0.8622042523 | 19.8134 | 15 | — |
| 12 | succeeded | -0.8549499006 | 19.2302 | 14 | — |
| 13 | succeeded | -0.8216991036 | 18.87 | 13 | — |
| 14 | succeeded | -0.8365651374 | 16.3215 | 11 | — |
| 15 | succeeded | -0.8111796445 | 16.2803 | 11 | — |
| 16 | succeeded | -0.9061506034 | 15.5262 | 11 | — |
| 17 | succeeded | -0.8088905425 | 15.8963 | 11 | — |
| 18 | succeeded | -0.8304945330 | 15.6653 | 11 | — |
| 19 | succeeded | -0.8650011560 | 16.0411 | 11 | — |
| 20 | succeeded | -0.8011350406 | 15.9168 | 11 | — |
| 21 | succeeded | -0.8848523296 | 16.9095 | 11 | — |