Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.85867
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8484257979hartree
Shots1024
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
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2026-02-11T14:39:27+01:00
- Wall time (s)
- 360
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)
- 0.00884923
- Signed error (Ha)
- 0.00884923
- Total QPU time (s)
- 50
- 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 | -1.8277107058 | 19.823 | 2 | — |
| 2 | succeeded | -0.5768348939 | 6.79666 | 2 | — |
| 3 | succeeded | -0.9057612921 | 7.95501 | 2 | — |
| 4 | succeeded | -1.6640433278 | 32.3763 | 10 | — |
| 5 | succeeded | -1.6488564865 | 7.13072 | 2 | — |
| 6 | succeeded | -1.8479314986 | 6.99266 | 2 | — |
| 7 | succeeded | -1.8396780169 | 7.14903 | 2 | — |
| 8 | succeeded | -1.8256793407 | 7.21049 | 2 | — |
| 9 | succeeded | -1.8479271543 | 18.8603 | 4 | — |
| 10 | succeeded | -1.8478621256 | 21.7747 | 2 | — |
| 11 | succeeded | -1.8413560008 | 30.5516 | 2 | — |
| 12 | succeeded | -1.8558468041 | 22.5983 | 2 | — |
| 13 | succeeded | -1.8529482090 | 21.7571 | 2 | — |
| 14 | succeeded | -1.8362742617 | 22.7481 | 2 | — |
| 15 | succeeded | -1.8538696069 | 21.4894 | 2 | — |
| 16 | succeeded | -1.8418546444 | 21.5119 | 2 | — |
| 17 | succeeded | -1.8460952194 | 21.8131 | 2 | — |
| 18 | succeeded | -1.8429863333 | 22.5253 | 2 | — |
| 19 | succeeded | -1.8586716820 | 22.1684 | 2 | — |
| 20 | succeeded | -1.8484257979 | 28.6212 | 2 | — |