Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 40
- Best energy (Ha)
- -1.85436
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_aachen
Final energy-1.8543595619hartree
Shots1024
Runtime executionsingle-job
Resilience0
MappingPT
Active space2e,2o
Execution
- Mode
- hardware
- Provider
- IBM Quantum
- Compute resource
- ibm_aachen
- Resource type
- ibm quantum hardware
- Processor family
- Heron r2
- Processor model
- —
- Processor revision
- —
- Qubits
- —
- Connectivity
- —
- Runtime execution
- single-job
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 0
- Submitted
- 2026-03-09T22:23:11+01:00
- Wall time (s)
- 227
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
29 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 | -1.8192339001 | 28.2414 | 9 | — |
| 2 | succeeded | -0.5285062408 | 7.40312 | 2 | — |
| 3 | succeeded | -0.8770745544 | 6.08108 | 3 | — |
| 4 | succeeded | -1.2951328527 | 5.73492 | 2 | — |
| 5 | succeeded | -1.7895781132 | 6.91177 | 3 | — |
| 6 | succeeded | -1.7663004299 | 6.60405 | 3 | — |
| 7 | succeeded | -1.8402286562 | 5.80599 | 2 | — |
| 8 | succeeded | -1.8381148852 | 6.66606 | 3 | — |
| 9 | succeeded | -1.8285627307 | 7.19371 | 3 | — |
| 10 | succeeded | -1.8383923770 | 5.83863 | 2 | — |
| 11 | succeeded | -1.8265877055 | 5.70686 | 2 | — |
| 12 | succeeded | -1.8378265326 | 5.74714 | 2 | — |
| 13 | succeeded | -1.8321680883 | 6.82764 | 2 | — |
| 14 | succeeded | -1.8319621416 | 5.96675 | 2 | — |
| 15 | succeeded | -1.8396628118 | 5.8818 | 2 | — |
| 16 | succeeded | -1.8349279375 | 6.07554 | 3 | — |
| 17 | succeeded | -1.8369766799 | 6.02645 | 2 | — |
| 18 | succeeded | -1.8405104923 | 6.19939 | 3 | — |
| 19 | succeeded | -1.8406514104 | 5.91874 | 2 | — |
| 20 | succeeded | -1.8423489437 | 6.65622 | 3 | — |
| 21 | succeeded | -1.8455987479 | 6.41055 | 3 | — |
| 22 | succeeded | -1.8417115542 | 6.80105 | 3 | — |
| 23 | succeeded | -1.8516756021 | 6.86295 | 3 | — |
| 24 | succeeded | -1.8543595619 | 6.00117 | 2 | — |
| 25 | succeeded | -1.8456009201 | 6.03849 | 2 | — |
| 26 | succeeded | -1.8370482250 | 5.63345 | 2 | — |
| 27 | succeeded | -1.8289920013 | 30.2933 | 9 | — |
| 28 | succeeded | -1.8348585645 | 5.63284 | 2 | — |
| 29 | succeeded | -1.8444670590 | 5.32682 | 2 | — |