We present a quantum-enhanced protocol for detecting wave-like dark matter using an array of N entangled superconducting cavities initialized in an m-photon Fock state. By distributing and recollecting the quantum state with an entanglement-distribution operation, the scan rate scales as N2(m+1) while thermal excitation is the dominant background, significantly outperforming classical single-cavity methods under matched conditions. We evaluate the robustness of our scheme against additional noise sources, including decoherence and beamsplitter infidelity, through theoretical analysis and numerical simulations. In practice, the key requirements, namely high-Q superconducting radio-frequency cavities that support long integration times, high-fidelity microwave beamsplitters, and universal cavity control, are already available on current experimental platforms, making the protocol experimentally feasible.
@article{arxiv.2510.26754,
title = {Quantum Enhanced Dark-Matter Search with Entangled Fock States in High-Quality Cavities},
author = {Benjamin Freiman and Xinyuan You and Andy C. Y. Li and Raphael Cervantes and Taeyoon Kim and Anna Grasselino and Roni Harnik and Yao Lu},
journal= {arXiv preprint arXiv:2510.26754},
year = {2026}
}