Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.8574
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8388823320hartree
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_pittsburgh
- Resource type
- quantum processor
- Processor family
- Heron
- Processor model
- ibm_pittsburgh
- Processor revision
- 3
- Qubits
- 156
- Connectivity
- Not recorded
- Runtime execution
- session
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2026-02-11T14:51:26+01:00
- Wall time (s)
- 142
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)
- 0.0183927
- Signed error (Ha)
- 0.0183927
- Total QPU time (s)
- 20
- 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 | -1.8294776120 | 17.7346 | 1 | — |
| 2 | succeeded | -0.6071454476 | 6.96294 | 1 | — |
| 3 | succeeded | -0.8517785390 | 7.02072 | 1 | — |
| 4 | succeeded | -1.5936684634 | 6.41881 | 1 | — |
| 5 | succeeded | -1.6430636406 | 6.59775 | 1 | — |
| 6 | succeeded | -1.8496290319 | 7.03326 | 1 | — |
| 7 | succeeded | -1.8224360530 | 6.81351 | 1 | — |
| 8 | succeeded | -1.8207341753 | 6.93685 | 1 | — |
| 9 | succeeded | -1.8518858931 | 7.01147 | 1 | — |
| 10 | succeeded | -1.8449591862 | 6.9561 | 1 | — |
| 11 | succeeded | -1.8573969029 | 6.34075 | 1 | — |
| 12 | succeeded | -1.8501189869 | 9.07817 | 1 | — |
| 13 | succeeded | -1.8508235772 | 7.99855 | 1 | — |
| 14 | succeeded | -1.8454534855 | 7.32073 | 1 | — |
| 15 | succeeded | -1.8325930146 | 6.69441 | 1 | — |
| 16 | succeeded | -1.8437581244 | 7.2514 | 1 | — |
| 17 | succeeded | -1.8564061321 | 6.76932 | 1 | — |
| 18 | succeeded | -1.8499780688 | 6.79908 | 1 | — |
| 19 | succeeded | -1.8474328549 | 6.44694 | 1 | — |
| 20 | succeeded | -1.8388823320 | 7.14129 | 1 | — |