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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
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qubithub.toml · 350 B

Code

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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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