Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.90482
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.9048171911hartree
Shots16
Runtime executionsingle-job
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_pittsburgh
- Resource type
- quantum processor
- Processor family
- Heron
- Processor model
- ibm_pittsburgh
- Processor revision
- 3
- Qubits
- 156
- Connectivity
- Not recorded
- Runtime execution
- single-job
- Shots
- 16
- Precision
- 0.25
- Resilience
- 0
- Submitted
- 2026-03-02T23:36:24+01:00
- Wall time (s)
- 1027
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)
- 0.0475422
- Signed error (Ha)
- -0.0475422
- Total QPU time (s)
- 16
- 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
12 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 | -1.9048171911 | 875.281 | 5 | — |
| 2 | succeeded | -0.8827783417 | 16.3843 | 1 | — |
| 3 | succeeded | -0.8783384727 | 8.44782 | 1 | — |
| 4 | succeeded | -1.3575837228 | 7.92498 | 1 | — |
| 5 | succeeded | -1.9048171911 | 8.92753 | 1 | — |
| 6 | succeeded | -1.8143515912 | 8.38997 | 1 | — |
| 7 | succeeded | -1.6696344351 | 8.58051 | 1 | — |
| 8 | succeeded | -1.8822007911 | 9.32764 | 1 | — |
| 9 | succeeded | -1.8143515912 | 52.4301 | 1 | — |
| 10 | succeeded | -1.9048171911 | 13.1952 | 1 | — |
| 11 | succeeded | -1.8595843912 | 9.48244 | 1 | — |
| 12 | succeeded | -1.7374836350 | 9.23731 | 1 | — |