Quantum · Postgraduate · Variational algorithms

Quantum VQE.

The variational quantum eigensolver finds a Hamiltonian's ground state without diagonalizing it. A parameterized circuit |ψ(θ)⟩ = RY·RY → CNOT → RY·RY prepares a trial state; a classical optimizer nudges θ to lower the measured energy ⟨ψ|H|ψ⟩. Watch it descend to the true ground energy of a transverse-field Ising model — the algorithm at the heart of near-term quantum chemistry.