Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.61748
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.6174780855hartree
Shots256
Runtime executionsingle-job
Resilience1
MappingJW
Active space2e,2o
Jordan-Wigner mapping · 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
- 256
- Precision
- 0.0625
- Resilience
- 1
- Submitted
- 2026-03-03T15:08:58+01:00
- Wall time (s)
- 439
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
- 96
- Two-qubit gates
- 48
- 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)
- 0.239797
- Signed error (Ha)
- 0.239797
- Total QPU time (s)
- 209
- 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
19 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 | -1.6120169167 | 72.9057 | 11 | — |
| 2 | succeeded | -0.7138133724 | 20.3821 | 11 | — |
| 3 | succeeded | -0.8200310482 | 19.1474 | 11 | — |
| 4 | succeeded | -1.2188295230 | 31.6393 | 11 | — |
| 5 | succeeded | -1.4910494189 | 19.1476 | 11 | — |
| 6 | succeeded | -1.4620393301 | 19.5561 | 11 | — |
| 7 | succeeded | -1.4762345301 | 20.0706 | 11 | — |
| 8 | succeeded | -1.5168373338 | 19.4532 | 11 | — |
| 9 | succeeded | -1.5111970188 | 19.5329 | 11 | — |
| 10 | succeeded | -1.5928876669 | 19.4508 | 11 | — |
| 11 | succeeded | -1.5655111471 | 20.3781 | 11 | — |
| 12 | succeeded | -1.4653713813 | 20.0349 | 11 | — |
| 13 | succeeded | -1.3733908856 | 29.2584 | 11 | — |
| 14 | succeeded | -1.6174780855 | 34.8031 | 11 | — |
| 15 | succeeded | -1.5337005672 | 21.2128 | 11 | — |
| 16 | succeeded | -1.5895297426 | 19.8883 | 11 | — |
| 17 | succeeded | -1.5522679484 | 19.9628 | 11 | — |
| 18 | succeeded | -1.4633865465 | 19.6009 | 11 | — |
| 19 | succeeded | -1.5105193755 | 19.5134 | 11 | — |