Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.69577
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.6791302496hartree
Shots2048
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_aachen
- Resource type
- quantum processor
- Processor family
- Heron
- Processor model
- ibm_aachen
- Processor revision
- 3
- Qubits
- 156
- Connectivity
- Not recorded
- Runtime execution
- session
- Shots
- 2048
- Precision
- 0.0220971
- Resilience
- 0
- Submitted
- 2025-12-28T17:51:42+01:00
- Wall time (s)
- 130
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)
- 0.178145
- Signed error (Ha)
- 0.178145
- Total QPU time (s)
- 39
- 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
18 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 | -1.6428739851 | 632.29 | 3 | — |
| 2 | succeeded | -0.6355568656 | 6.9919 | 2 | — |
| 3 | succeeded | -0.8752989595 | 6.59351 | 2 | — |
| 4 | succeeded | -1.4870405928 | 6.84734 | 2 | — |
| 5 | succeeded | -1.5292402598 | 6.98754 | 3 | — |
| 6 | succeeded | -1.6957716827 | 6.8901 | 2 | — |
| 7 | succeeded | -1.6665288753 | 7.074 | 2 | — |
| 8 | succeeded | -1.6740116519 | 6.77858 | 2 | — |
| 9 | succeeded | -1.6747823570 | 6.70086 | 2 | — |
| 10 | succeeded | -1.6822413079 | 6.72465 | 3 | — |
| 11 | succeeded | -1.6846770320 | 6.27101 | 2 | — |
| 12 | succeeded | -1.6875756271 | 6.18456 | 2 | — |
| 13 | succeeded | -1.6734761496 | 7.09125 | 2 | — |
| 14 | succeeded | -1.6880677542 | 6.59793 | 2 | — |
| 15 | succeeded | -1.6765525215 | 6.20689 | 2 | — |
| 16 | succeeded | -1.6940047764 | 7.1136 | 2 | — |
| 17 | succeeded | -1.6818879267 | 6.61379 | 2 | — |
| 18 | succeeded | -1.6791302496 | 6.3863 | 2 | — |