  We study the possibility of deterministic protocols for extracting work from
quantum systems. Focusing on the two-point measurement work extraction
scenario, we prove that, with enough copies of the system, such
zero-fluctuation protocols always exist if the Hamiltonian has a rational
spectrum. Leveraging this result, we show that for any Hamiltonian, it is
possible to construct an unitary driving protocol on sufficiently many copies
of the system with work fluctuations strictly bounded within an arbitrary
interval $\pm \delta$, albeit requiring exponentially many copies in
$1/\delta$.
