Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -0.908577
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_brussels
Final energy-0.9085774865hartree
Shots256
Runtime executionsingle-job
Resilience0
MappingJW
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
- 2026-02-24T23:09:28+01:00
- Wall time (s)
- 126
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
- 4
- Physical qubits
- —
- Parameters
- —
- Depth
- 96
- Two-qubit gates
- 48
- 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
23 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 | -0.8369530642 | 5.13917 | 1 | — |
| 2 | succeeded | -0.8203949749 | 5.10471 | 1 | — |
| 3 | succeeded | -0.7771945380 | 5.03457 | 1 | — |
| 4 | succeeded | -0.8115858664 | 5.26309 | 1 | — |
| 5 | succeeded | -0.8672327531 | 5.04818 | 1 | — |
| 6 | succeeded | -0.7739485256 | 4.78517 | 1 | — |
| 7 | succeeded | -0.9085774865 | 5.17228 | 1 | — |
| 8 | succeeded | -0.8966749652 | 5.00063 | 1 | — |
| 9 | succeeded | -0.8545602363 | 5.23931 | 1 | — |
| 10 | succeeded | -0.8455689069 | 4.8978 | 1 | — |
| 11 | succeeded | -0.8689092306 | 5.02837 | 1 | — |
| 12 | succeeded | -0.7831470517 | 5.14035 | 1 | — |
| 13 | succeeded | -0.8876526112 | 4.94881 | 1 | — |
| 14 | succeeded | -0.8306360798 | 5.05651 | 1 | — |
| 15 | succeeded | -0.8842254547 | 5.051 | 1 | — |
| 16 | succeeded | -0.8661307776 | 4.82382 | 1 | — |
| 17 | succeeded | -0.8769138184 | 10.159 | 5 | — |
| 18 | succeeded | -0.8991268980 | 6.42425 | 2 | — |
| 19 | succeeded | -0.8352406232 | 5.83359 | 2 | — |
| 20 | succeeded | -0.8620178872 | 6.64193 | 2 | — |
| 21 | succeeded | -0.8571946356 | 5.51771 | 1 | — |
| 22 | succeeded | -0.8190300978 | 5.22379 | 1 | — |
| 23 | succeeded | -0.8659595721 | 4.79439 | 1 | — |