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The manipulation of quantum states of light has resulted in significantadvancements in both dark matter searches and gravitational wave detectors[1-4]. Current dark matter searches operating in the microwave frequency rangeuse nearly quantum-limited amplifiers [3, 5, 6]. Future high frequency searcheswill use photon counting techniques [1] to evade the standard quantum limit. Wepresent a signal enhancement technique that utilizes a superconducting qubit toprepare a superconducting microwave cavity in a non-classical Fock state andstimulate the emission of a photon from a dark matter wave. By initializing thecavity in an $|n=4\rangle$ Fock state, we demonstrate a quantum enhancementtechnique that increases the signal photon rate and hence also the dark matterscan rate each by a factor of 2.78. Using this technique, we conduct a darkphoton search in a band around $\mathrm{5.965\, GHz \, (24.67\, \mu eV)}$,where the kinetic mixing angle $\epsilon \geq 4.35 \times 10^{-13}$ is excludedat the $90\%$ confidence level.

Stimulated emission of signal photons from dark matter waves