Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.88785
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-1.8878548911hartree
Shots64
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
- 64
- Precision
- 0.125
- Resilience
- 0
- Submitted
- 2026-03-06T23:35:14+01:00
- Wall time (s)
- 153
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
24 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 | -1.7759176131 | 4.36693 | 1 | — |
| 2 | succeeded | -0.7199889183 | 4.86859 | 1 | — |
| 3 | succeeded | -0.9179171727 | 17.3838 | 2 | — |
| 4 | succeeded | -1.2750616666 | 4.64274 | 1 | — |
| 5 | succeeded | -1.8166410349 | 4.43802 | 1 | — |
| 6 | succeeded | -1.6685592224 | 4.44273 | 1 | — |
| 7 | succeeded | -1.8324586130 | 4.62565 | 1 | — |
| 8 | succeeded | -1.8595843912 | 5.09359 | 1 | — |
| 9 | succeeded | -1.7363389132 | 5.06619 | 1 | — |
| 10 | succeeded | -1.8878548911 | 4.89184 | 1 | — |
| 11 | succeeded | -1.7612447568 | 4.7191 | 1 | — |
| 12 | succeeded | -1.8878548911 | 4.42148 | 1 | — |
| 13 | succeeded | -1.8573297021 | 4.38248 | 1 | — |
| 14 | succeeded | -1.8856002021 | 4.51959 | 1 | — |
| 15 | succeeded | -1.8075875240 | 4.78355 | 1 | — |
| 16 | succeeded | -1.7001943787 | 4.50815 | 1 | — |
| 17 | succeeded | -1.8177510021 | 5.12442 | 1 | — |
| 18 | succeeded | -1.7962793240 | 4.39225 | 1 | — |
| 19 | succeeded | -1.8573297021 | 8.30184 | 5 | — |
| 20 | succeeded | -1.8347133021 | 8.43969 | 4 | — |
| 21 | succeeded | -1.7601000350 | 6.71358 | 3 | — |
| 22 | succeeded | -1.8460215021 | 5.00237 | 1 | — |
| 23 | succeeded | -1.7386283568 | 20.4935 | 2 | — |
| 24 | succeeded | -1.8437668130 | 4.80074 | 1 | — |