Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 25
- Best energy (Ha)
- -1.8644
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8578933744hartree
Shots256
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
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2025-11-20T12:43:02+01:00
- Wall time (s)
- 129
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)
- 0.000618344
- Signed error (Ha)
- -0.000618344
- Total QPU time (s)
- 38
- 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 | -1.8265096439 | 2389.23 | 2 | — |
| 2 | succeeded | -0.5543637563 | 7.80025 | 2 | — |
| 3 | succeeded | -0.8899328532 | 6.41543 | 2 | — |
| 4 | succeeded | -1.6055403357 | 6.36495 | 2 | — |
| 5 | succeeded | -1.6450408378 | 6.61262 | 2 | — |
| 6 | succeeded | -1.8587432271 | 6.37953 | 2 | — |
| 7 | succeeded | -1.8053328349 | 6.55239 | 2 | — |
| 8 | succeeded | -1.8522479630 | 6.90111 | 2 | — |
| 9 | succeeded | -1.8409310744 | 8.06094 | 2 | — |
| 10 | succeeded | -1.8220002658 | 6.67393 | 2 | — |
| 11 | succeeded | -1.8587432271 | 6.68347 | 2 | — |
| 12 | succeeded | -1.8287817103 | 6.18678 | 2 | — |
| 13 | succeeded | -1.8626976216 | 6.34013 | 2 | — |
| 14 | succeeded | -1.8643973271 | 7.01737 | 2 | — |
| 15 | succeeded | -1.8488572408 | 6.62792 | 2 | — |
| 16 | succeeded | -1.8149326408 | 6.62498 | 2 | — |
| 17 | succeeded | -1.8479986994 | 6.55237 | 2 | — |
| 18 | succeeded | -1.8511119298 | 6.64599 | 2 | — |
| 19 | succeeded | -1.8578933744 | 6.51366 | 2 | — |