Quantum Enhanced Dark-Matter Search with Entangled Fock States in High-Quality Cavities

• URL: http://arxiv.org/abs/2510.26754v2
• Date: Sun, 02 Nov 2025 02:29:14 GMT
• Title: Quantum Enhanced Dark-Matter Search with Entangled Fock States in High-Quality Cavities
• Authors: Benjamin Freiman, Xinyuan You, Andy C. Y. Li, Raphael Cervantes, Taeyoon Kim, Anna Grasselino, Roni Harnik, Yao Lu,
• Abstract summary: We present a quantum-enhanced protocol for detecting wave-like dark matter using an array of superconducting cavities in a $m$-photon Fock state.<n>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.<n>We evaluate the robustness of our scheme against additional noise sources, including decoherence and beamsplitter infidelity, through theoretical analysis and numerical simulations.
• Score: 3.6533442071476254
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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 $N^2(m+1)$ 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.

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