Method
- Mapper
- P
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.4082
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.3716599137hartree
Shots1024
Runtime executionsession
Resilience0
MappingP
Active space2e,2o
Parity mapping without qubit reduction · 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
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2025-12-15T14:14:24+01:00
- Wall time (s)
- 117
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
- 74
- Two-qubit gates
- 32
- 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)
- 0.485615
- Signed error (Ha)
- 0.485615
- Total QPU time (s)
- 37
- 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 | -1.3855028737 | 9.02459 | 3 | — |
| 2 | succeeded | -0.7744221346 | 6.77797 | 2 | — |
| 3 | succeeded | -0.8843589093 | 6.81181 | 2 | — |
| 4 | succeeded | -1.2869859310 | 6.87942 | 2 | — |
| 5 | succeeded | -1.2618825891 | 6.23023 | 2 | — |
| 6 | succeeded | -1.3455457842 | 6.42022 | 2 | — |
| 7 | succeeded | -1.4069485698 | 6.55308 | 2 | — |
| 8 | succeeded | -1.4082013626 | 6.20521 | 2 | — |
| 9 | succeeded | -1.3355473159 | 6.13219 | 2 | — |
| 10 | succeeded | -1.4034975875 | 6.13597 | 2 | — |
| 11 | succeeded | -1.3329292613 | 6.7502 | 2 | — |
| 12 | succeeded | -1.3482681311 | 6.78886 | 2 | — |
| 13 | succeeded | -1.3427050633 | 6.13985 | 2 | — |
| 14 | succeeded | -1.3565002675 | 6.36006 | 2 | — |
| 15 | succeeded | -1.3589430036 | 6.15016 | 2 | — |
| 16 | succeeded | -1.3620753864 | 6.42857 | 2 | — |
| 17 | succeeded | -1.3876284276 | 6.05589 | 2 | — |
| 18 | succeeded | -1.3716599137 | 6.05305 | 2 | — |