qubithubh2o-ground-state

Finds the ground state energy of water (H2O) using VQE with active space reduction — bringing a 10-electron molecule down to 4 qubits with a 2-layer hardware-efficient ansatz, all-to-all entangling connectivity, and 20 variational parameters. Uses a simplified 12-term Hamiltonian with exact ground state -76.0618 Hartree (FCI/STO-3G).

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Framework: Qiskit
Qubits: 4
Depth: 20
Gate set: RY, RZ, CX
Licence: Not specified
Version: v1
Updated: 3 days ago
Last run: 3 months ago

Circuit

circuit.py · Qiskit · depth 20

5 of 7 runs

Status	Backend	Shots	Wall time
Completed	Simulator aer_simulator	1024	16.4 s
Completed	Simulator aer_simulator	1024	17.7 s
Completed	Simulator qiskit_aer	1024	15.6 s
Completed	Simulator qiskit_aer	1024	4.8 s
Completed	Simulator qiskit_aer	1024	5.0 s

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Suggested citation

@software{qubithub_h2ogroundstate_2026,
  author = {QubitHub Circuits},
  title = {VQE for H2O Molecule},
  year = {2026},
  version = {v1},
  url = {https://qubithub.co/qubithub/h2o-ground-state},
}

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