Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.87034
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8525254548hartree
Shots256
Runtime executionsingle-job
Resilience0
MappingPT
Active space2e,2o
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_brussels
- Resource type
- ibm quantum hardware
- Processor family
- Eagle r3
- Processor model
- —
- Processor revision
- —
- Qubits
- —
- Connectivity
- —
- Runtime execution
- single-job
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2026-02-15T22:51:16+01:00
- Wall time (s)
- 93
Molecular system
- Charge
- 0
- Multiplicity
- 1
- Basis
- STO-3G
- Active space
- 2e,2o
- Active electrons
- 2
- Spatial orbitals
- 2
- Geometry units
- angstrom
Circuit
- Logical qubits
- 1
- Physical qubits
- —
- Parameters
- —
- Depth
- 1
- Two-qubit gates
- 0
- Hamiltonian terms
- —
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.
| Attempt | Outcome | Energy (Ha) | Elapsed (s) | Quantum (s) | Parameters |
|---|---|---|---|---|---|
| 1 | succeeded | -1.8202918717 | 4.62548 | 1 | — |
| 2 | succeeded | -0.5608677090 | 4.71543 | 1 | — |
| 3 | succeeded | -0.8811655227 | 5.09429 | 1 | — |
| 4 | succeeded | -1.6247573248 | 4.62449 | 1 | — |
| 5 | succeeded | -1.6603034324 | 4.61396 | 1 | — |
| 6 | succeeded | -1.8562023576 | 5.60986 | 1 | — |
| 7 | succeeded | -1.8104232626 | 4.39196 | 1 | — |
| 8 | succeeded | -1.8381040244 | 4.97367 | 1 | — |
| 9 | succeeded | -1.8499845853 | 4.69383 | 1 | — |
| 10 | succeeded | -1.8050379658 | 4.51751 | 1 | — |
| 11 | succeeded | -1.8022109158 | 4.46331 | 1 | — |
| 12 | succeeded | -1.8468713548 | 4.56834 | 1 | — |
| 13 | succeeded | -1.8703376075 | 4.62322 | 1 | — |
| 14 | succeeded | -1.8604429326 | 4.76628 | 1 | — |
| 15 | succeeded | -1.8349994826 | 5.34771 | 1 | — |
| 16 | succeeded | -1.8276543658 | 5.59016 | 1 | — |
| 17 | succeeded | -1.8338721380 | 5.34214 | 1 | — |
| 18 | succeeded | -1.8383902048 | 4.71646 | 1 | — |
| 19 | succeeded | -1.8525254548 | 4.78475 | 1 | — |