Method
- Mapper
- PT
- Ansatz
- UCC
- Optimizer
- COBYLA
- Maximum iterations
- 30
- Best energy (Ha)
- -1.87627
H2
H2 VQE accuracy-cost benchmark · hardware · ibm_pittsburgh
Final energy-1.8709012798hartree
Shots256
Runtime executionsession
Resilience0
MappingPT
Active space2e,2o
Parity mapping with full symmetry tapering · 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
- session
- Shots
- 256
- Precision
- 0.0625
- Resilience
- 0
- Submitted
- 2025-12-17T16:19:41+01:00
- Wall time (s)
- 129
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
- 1
- Physical qubits
- Not recorded
- Parameters
- Not recorded
- Depth
- 1
- Two-qubit gates
- 0
- 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)
- 0.0136262
- Signed error (Ha)
- -0.0136262
- Total QPU time (s)
- 19
- 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
19 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 | -1.8412085662 | 1766.64 | 1 | — |
| 2 | succeeded | -0.5704762035 | 6.46 | 1 | — |
| 3 | succeeded | -0.8879556559 | 6.77748 | 1 | — |
| 4 | succeeded | -1.6544326611 | 6.88692 | 1 | — |
| 5 | succeeded | -1.6229967988 | 6.938 | 1 | — |
| 6 | succeeded | -1.8700514271 | 6.71328 | 1 | — |
| 7 | succeeded | -1.8400985990 | 6.52459 | 1 | — |
| 8 | succeeded | -1.8697739353 | 7.29696 | 1 | — |
| 9 | succeeded | -1.8395175494 | 6.73227 | 1 | — |
| 10 | succeeded | -1.8395262380 | 6.73104 | 1 | — |
| 11 | succeeded | -1.8386763853 | 7.05731 | 1 | — |
| 12 | succeeded | -1.8581795548 | 6.48972 | 1 | — |
| 13 | succeeded | -1.8355631549 | 6.90753 | 1 | — |
| 14 | succeeded | -1.8335859576 | 6.88792 | 1 | — |
| 15 | succeeded | -1.8762691993 | 6.92327 | 1 | — |
| 16 | succeeded | -1.8398037298 | 6.0155 | 1 | — |
| 17 | succeeded | -1.8446079771 | 6.65858 | 1 | — |
| 18 | succeeded | -1.8448941576 | 6.91407 | 1 | — |
| 19 | succeeded | -1.8709012798 | 6.14859 | 1 | — |