Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.8463
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_miami
Final energy-1.8462989939hartree
Shots256
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_miami
- Resource type
- ibm quantum hardware
- Processor family
- Nighthawk r1
- Processor model
- Not recorded
- Processor revision
- Not recorded
- Qubits
- Not recorded
- Connectivity
- Not recorded
- Runtime execution
- single-job
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2026-03-09T11:46:58+01:00
- Wall time (s)
- 180
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)
- 0.010976
- Signed error (Ha)
- 0.010976
- Total QPU time (s)
- 60
- 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 | -1.8395175494 | 8.99443 | 3 | — |
| 2 | succeeded | -0.6515934234 | 8.76327 | 3 | — |
| 3 | succeeded | -0.8195601610 | 8.8792 | 3 | — |
| 4 | succeeded | -1.2773250443 | 9.38091 | 3 | — |
| 5 | succeeded | -1.7072620037 | 8.70476 | 3 | — |
| 6 | succeeded | -1.7685638077 | 9.06053 | 3 | — |
| 7 | succeeded | -1.8087148685 | 11.8725 | 3 | — |
| 8 | succeeded | -1.7764812854 | 8.7317 | 3 | — |
| 9 | succeeded | -1.8259459717 | 8.00984 | 3 | — |
| 10 | succeeded | -1.8115332299 | 8.5768 | 3 | — |
| 11 | succeeded | -1.8462989939 | 8.29401 | 3 | — |
| 12 | succeeded | -1.8135104271 | 8.72992 | 3 | — |
| 13 | succeeded | -1.7855261076 | 10.0289 | 3 | — |
| 14 | succeeded | -1.7973979799 | 8.90948 | 3 | — |
| 15 | succeeded | -1.8075701467 | 8.53852 | 3 | — |
| 16 | succeeded | -1.8299090549 | 8.55244 | 3 | — |
| 17 | succeeded | -1.8081425076 | 8.37162 | 3 | — |
| 18 | succeeded | -1.8112557381 | 9.0888 | 3 | — |
| 19 | succeeded | -1.8149239521 | 8.73677 | 3 | — |
| 20 | succeeded | -1.8177510021 | 9.12638 | 3 | — |