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Uncovering the nature of dark matter is one of the most important goals ofparticle physics. Light bosonic particles, such as the dark photon, arewell-motivated candidates: they are generally long-lived, weakly-interacting,and naturally produced in the early universe. In this work, we report onLAMPOST (Light $A'$ Multilayer Periodic Optical SNSPD Target), aproof-of-concept experiment searching for dark photon dark matter in the eVmass range, via coherent absorption in a multi-layer dielectric haloscope.Using a superconducting nanowire single-photon detector (SNSPD), we achieveefficient photon detection with a dark count rate (DCR) of $\sim6\times10^{-6}$ counts/s. We find no evidence for dark photon dark matter inthe mass range of $\sim 0.7$-$0.8$ eV with kinetic mixing $\epsilon \gtrsim10^{-12}$, improving existing limits in $\epsilon$ by up to a factor of two.With future improvements to SNSPDs, our architecture could probe significantnew parameter space for dark photon and axion dark matter in the meV to 10 eVmass range.

New Constraints on Dark Photon Dark Matter with Superconducting Nanowire Detectors in an Optical Haloscope