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H2

H2 VQE accuracy-cost benchmark · hardware · ibm_kingston

Final energy-1.8347886485hartree
Shots4096
Runtime executionsession
Resilience0
MappingPT
Active space2e,2o

Parity mapping with full symmetry tapering · Shots and precision · Resilience settings

Method

Mapper
PT
Ansatz
UCC
Optimizer
SPSA
Maximum iterations
200
Best energy (Ha)
-1.83808

Execution

Mode
hardware
Provider
IBM Quantum
Compute resource
ibm_kingston
Resource type
ibm quantum hardware
Processor family
Heron r2
Processor model
Not recorded
Processor revision
Not recorded
Qubits
Not recorded
Connectivity
Not recorded
Runtime execution
session
Shots
4096
Precision
0.015625
Resilience
0
Submitted
2025-09-04T01:24:30+02:00
Wall time (s)
3723

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)
0.0224864
Signed error (Ha)
0.0224864
Total QPU time (s)
1805
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)
Atomxyz
H000
H000.735

Dataset publication

Associated articles

Compute access

  • Fraunhofer Quantum Now and EQeS · IBM Quantum · allocation: Fraunhofer Quantum Now

Optimization trajectory

451 recorded objective evaluations. Charts use cumulative time so convergence cost remains comparable across calculations.

Download trajectory CSV · Download trajectory JSON

Energy (Ha)
Signed reference error (mHa)
Cumulative quantum time (s)
Cumulative wall time (s)
AttemptOutcomeEnergy (Ha)Elapsed (s)Quantum (s)Parameters
1succeeded -1.82096561097.68537 4—
2succeeded -1.69376407528.12417 4—
3succeeded -1.81453646158.13277 4—
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5succeeded -1.68749155807.79123 4—
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