Method
- Mapper
- JW
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.6093
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.6092998623hartree
Shots1024
Runtime executionsingle-job
Resilience1
MappingJW
Active space2e,2o
Jordan-Wigner mapping · 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
- single-job
- Shots
- 1024
- Precision
- 0.03125
- Resilience
- 1
- Submitted
- 2026-03-03T15:24:26+01:00
- Wall time (s)
- 729
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
- 4
- Physical qubits
- Not recorded
- Parameters
- Not recorded
- Depth
- 96
- Two-qubit gates
- 48
- 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)
- 0.247975
- Signed error (Ha)
- 0.247975
- Total QPU time (s)
- 327
- 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
27 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 | -1.5114851295 | 19.9171 | 12 | — |
| 2 | succeeded | -0.9796379612 | 20.2206 | 12 | — |
| 3 | succeeded | -0.8940552563 | 20.1454 | 12 | — |
| 4 | succeeded | -1.2536977039 | 19.3004 | 12 | — |
| 5 | succeeded | -1.4896896853 | 20.2768 | 12 | — |
| 6 | succeeded | -1.4242076398 | 19.4815 | 12 | — |
| 7 | succeeded | -1.5810295566 | 19.9852 | 12 | — |
| 8 | succeeded | -1.4088225107 | 22.5724 | 12 | — |
| 9 | succeeded | -1.5740356202 | 24.4721 | 12 | — |
| 10 | succeeded | -1.5410077852 | 20.3328 | 12 | — |
| 11 | succeeded | -1.4571494549 | 21.1959 | 12 | — |
| 12 | succeeded | -1.5756206871 | 23.0738 | 12 | — |
| 13 | succeeded | -1.5590159920 | 23.4106 | 12 | — |
| 14 | succeeded | -1.4634554054 | 23.2151 | 12 | — |
| 15 | succeeded | -1.5802351745 | 120.121 | 12 | — |
| 16 | succeeded | -1.5380875548 | 32.1526 | 12 | — |
| 17 | succeeded | -1.4227293083 | 42.1791 | 15 | — |
| 18 | succeeded | -1.5648251117 | 20.1375 | 12 | — |
| 19 | succeeded | -1.5878046836 | 21.3924 | 12 | — |
| 20 | succeeded | -1.5075301947 | 21.8596 | 12 | — |
| 21 | succeeded | -1.4441170921 | 19.9052 | 12 | — |
| 22 | succeeded | -1.4587657045 | 19.5514 | 12 | — |
| 23 | succeeded | -1.5912812695 | 21.4004 | 12 | — |
| 24 | succeeded | -1.6030353607 | 22.4238 | 12 | — |
| 25 | succeeded | -1.5650890057 | 20.0669 | 12 | — |
| 26 | succeeded | -1.6092998623 | 39.0142 | 12 | — |
| 27 | succeeded | -1.4655003682 | 28.271 | 12 | — |