Floquet operator
= Floquet operator
{c}
{title2=$U_F=U(T,0)$}
For a periodic <Hamiltonian> $H(t+T)=H(t)$, the <Floquet operator> is the <unitary operator> evolving a <quantum state> through one complete period, at a fixed starting phase of the drive. The composition law gives $U(NT,0)=U_F^N$. Choosing a different starting phase conjugates $U_F$ by a <unitary operator>, so its <eigenvalues> are unchanged.