Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 25
- Best energy (Ha)
- -1.86532
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_fez
Final energy-1.8431294235hartree
Shots1024
Runtime executionsession
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_fez
- Resource type
- ibm quantum hardware
- Processor family
- Heron r2
- Processor model
- Not recorded
- Processor revision
- Not recorded
- Qubits
- Not recorded
- Connectivity
- Not recorded
- Runtime execution
- session
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2025-11-20T12:49:09+01:00
- Wall time (s)
- 147
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)
- 0.0141456
- Signed error (Ha)
- 0.0141456
- Total QPU time (s)
- 30
- 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 | -1.8253801272 | 1374.94 | 2 | — |
| 2 | succeeded | -0.5841128099 | 7.78494 | 1 | — |
| 3 | succeeded | -0.8796175961 | 7.0347 | 1 | — |
| 4 | succeeded | -1.5940240169 | 6.87789 | 2 | — |
| 5 | succeeded | -1.6752148178 | 6.4893 | 2 | — |
| 6 | succeeded | -1.8511141020 | 6.79627 | 1 | — |
| 7 | succeeded | -1.8159364446 | 7.43498 | 1 | — |
| 8 | succeeded | -1.8427803866 | 6.93054 | 2 | — |
| 9 | succeeded | -1.8466567195 | 6.25421 | 1 | — |
| 10 | succeeded | -1.8628450562 | 7.67466 | 2 | — |
| 11 | succeeded | -1.8514696554 | 6.91589 | 2 | — |
| 12 | succeeded | -1.8464529450 | 6.73262 | 1 | — |
| 13 | succeeded | -1.8653165528 | 7.70424 | 2 | — |
| 14 | succeeded | -1.8505482576 | 6.85544 | 1 | — |
| 15 | succeeded | -1.8401614554 | 7.20356 | 2 | — |
| 16 | succeeded | -1.8572603291 | 6.5465 | 1 | — |
| 17 | succeeded | -1.8386070124 | 6.83004 | 2 | — |
| 18 | succeeded | -1.8584635631 | 6.98263 | 2 | — |
| 19 | succeeded | -1.8316109325 | 7.02544 | 1 | — |
| 20 | succeeded | -1.8431294235 | 7.59329 | 1 | — |