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We probe the transition between superfluid and Bose glass phases usingquantum quenches of disorder in an ultracold atomic lattice gas that realizesthe disordered Bose-Hubbard model. Measurements of excitations generated by thequench exhibit threshold behavior in the disorder strength indicative of aphase transition. Ab-initio quantum Monte Carlo simulations confirm that theappearance of excitations coincides with the equilibrium superfluid--Bose-glassphase boundary at different lattice potential depths. By varying the quenchtime, we demonstrate the disappearance of an adiabatic timescale compared withmicroscopic parameters in the BG regime.

Probing the Bose-Glass--Superfluid Transition using Quantum Quenches of Disorder