  We point out that fractionalized bosonic charge excitations can explain the
recently discovered photo-induced superconducting-like response in
$\kappa\text{-(ET})_2\text{Cu}[\text{N(CN)}_2]\text{Br}$, an organic metal
close to the Mott transition. The pump laser exerts a periodic drive on the
fractionalized field, creating a non-equilibrium condensate, which gives a
Drude peak much narrower than the equilibrium scattering rate, hence
superconducting-like response. Our proposal illuminates new possibilities of
detecting fractionalization and can be readily tested in spin liquid candidates
and in cold atom systems.
