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We propose and experimentally demonstrate a method for detection of lightscalar Dark Matter (DM), through probing temporal oscillations of fundamentalconstants in an atomic optical transition. Utilizing the quantum informationnotion of Dynamic Decoupling (DD) in a table-top setting, we are able to obtainmodel-independent bounds on variations of $\alpha$ and $m_e$ at frequencies upto the MHz scale. We interpret our results to constrain the parameter space oflight scalar DM field models. We consider the generic case, where the couplingsof the DM field to the photon and to the electron are independent, as well asthe case of a relaxion DM model, including the scenario of a DM boson starcentered around Earth. Given the particular nature of DD, allowing to directlyobserve the oscillatory behaviour of coherent DM, and considering futureexperimental improvements, we conclude that our proposed method could becomplimentary to, and possibly competitive with, gravitational probes of lightscalar DM.

Constraining Rapidly Oscillating Scalar Dark Matter Using Dynamic Decoupling