Dark photons have been considered potential candidates for dark matter. The dark photon dark matter (DPDM) has a mass and interacts with electromagnetic fields via kinetic mixing with a coupling constant of $\chi$. Thus, DPDMs are converted into ordinary photons at metal surfaces. Using a millimeter-wave receiver set in a radioshielding box, we performed experiments to detect the conversion photons from the DPDM in the frequency range 10–18 GHz, which corresponds to a mass range $41–74\mathrm{\mu }\mathrm{eV}$. We found no conversion photon signal in this range and set the upper limits to $\chi <(0.5–3.9)\times {10}^{-10}$ at a 95% confidence level.

• Received 28 August 2023
• Accepted 15 November 2023

DOI:https://doi.org/10.1103/PhysRevD.109.012008

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Published by the American Physical Society