qubithubh2-excited-states

Finds both ground and first excited states of the hydrogen molecule (H2) using Variational Quantum Deflation (VQD) — a sequential variational algorithm that adds overlap penalties to enforce orthogonality between solutions. The energy gap to the first excited state (~0.85 Ha) determines the molecule's UV absorption spectrum.

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Framework: Qiskit
Qubits: 2
Depth: 12
Gate set: RY, CX
Licence: Not specified
Version: v1
Updated: 3 days ago
Last run: 3 months ago

Circuit

circuit.py · Qiskit · depth 12

4 runs

Status	Backend	Shots	Wall time
Completed	Simulator qiskit_aer	1024	15.0 s
Completed	Simulator qiskit_aer	1024	5.6 s
Completed	Simulator qiskit_aer	1024	5.7 s
Completed	Simulator qiskit_aer	1024	5.7 s

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Suggested citation

@software{qubithub_h2excitedstates_2026,
  author = {QubitHub Circuits},
  title = {H2 Excited States (VQD)},
  year = {2026},
  version = {v1},
  url = {https://qubithub.co/qubithub/h2-excited-states},
}

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Suggested citation