Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.86362
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_kingston
Final energy-1.8420692797hartree
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_kingston
- 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
- 2025-12-15T13:20:07+01:00
- Wall time (s)
- 155
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)
- 0.0152058
- Signed error (Ha)
- 0.0152058
- Total QPU time (s)
- 22
- 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 | -1.8347089578 | 7736.82 | 2 | — |
| 2 | succeeded | -0.5567680521 | 7.83503 | 1 | — |
| 3 | succeeded | -0.8192761527 | 7.11568 | 1 | — |
| 4 | succeeded | -1.5981908746 | 7.49863 | 1 | — |
| 5 | succeeded | -1.6503393844 | 7.77207 | 1 | — |
| 6 | succeeded | -1.8477190354 | 7.42111 | 2 | — |
| 7 | succeeded | -1.8052699784 | 6.97861 | 1 | — |
| 8 | succeeded | -1.8474437158 | 6.86521 | 1 | — |
| 9 | succeeded | -1.8412866278 | 7.17841 | 1 | — |
| 10 | succeeded | -1.8422795708 | 7.37375 | 1 | — |
| 11 | succeeded | -1.8444692312 | 6.95761 | 1 | — |
| 12 | succeeded | -1.8448941576 | 8.63332 | 1 | — |
| 13 | succeeded | -1.8600873791 | 7.58949 | 1 | — |
| 14 | succeeded | -1.8291372637 | 7.2208 | 1 | — |
| 15 | succeeded | -1.8444692312 | 6.64183 | 1 | — |
| 16 | succeeded | -1.8475087444 | 7.46697 | 1 | — |
| 17 | succeeded | -1.8636190195 | 7.74494 | 1 | — |
| 18 | succeeded | -1.8605123055 | 8.6854 | 1 | — |
| 19 | succeeded | -1.8520311555 | 7.72614 | 1 | — |
| 20 | succeeded | -1.8420692797 | 7.47867 | 1 | — |