Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.88374
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8658724946hartree
Shots1024
Runtime executionsession
Resilience2
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
- 2
- Submitted
- 2025-12-30T16:49:11+01:00
- Wall time (s)
- 392
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)
- 0.00859746
- Signed error (Ha)
- -0.00859746
- Total QPU time (s)
- 213
- 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 | -1.8355484139 | 2270.6 | 12 | — |
| 2 | succeeded | -0.5441926645 | 19.6273 | 11 | — |
| 3 | succeeded | -0.8263204460 | 20.8711 | 12 | — |
| 4 | succeeded | -1.6429349184 | 19.9647 | 12 | — |
| 5 | succeeded | -1.6859327729 | 20.0526 | 11 | — |
| 6 | succeeded | -1.8778907082 | 19.3566 | 11 | — |
| 7 | succeeded | -1.8478674159 | 19.6753 | 11 | — |
| 8 | succeeded | -1.8462435465 | 20.587 | 11 | — |
| 9 | succeeded | -1.8837408323 | 20.1672 | 11 | — |
| 10 | succeeded | -1.8833373020 | 20.9573 | 11 | — |
| 11 | succeeded | -1.8561915239 | 19.9554 | 11 | — |
| 12 | succeeded | -1.8574974504 | 19.6551 | 11 | — |
| 13 | succeeded | -1.8391851261 | 19.9804 | 11 | — |
| 14 | succeeded | -1.8574588790 | 19.2624 | 11 | — |
| 15 | succeeded | -1.8549235088 | 19.3444 | 11 | — |
| 16 | succeeded | -1.8475285956 | 18.7237 | 11 | — |
| 17 | succeeded | -1.8564559354 | 19.7949 | 11 | — |
| 18 | succeeded | -1.8535076988 | 19.8238 | 11 | — |
| 19 | succeeded | -1.8658724946 | 19.575 | 12 | — |