Function apply_gate_kernel 

pub fn apply_gate_kernel(
    state: &HilbertState,
    gate: &Gate,
) -> Result<HilbertState, PhysicsError>

Applies a quantum gate to a state: $|\psi’\rangle = U |\psi\rangle$.

Arguments

• state - Initial state $|\psi\rangle$.
• gate - Quantum gate/operator $U$.

Returns

• Ok(HilbertState) - New state $|\psi’\rangle$.