First experimental deployment of four-component cat states in a high-Q superconducting cavity yields 8.1-fold signal enhancement and constrains dark photon kinetic mixing to ε < 7.32 × 10^{-16} near 6.44 GHz with 10^{-16} sensitivity over 100 kHz bandwidth.
Zhao,et al., A Flux-Tunable cavity for Dark matter detection (2025), arXiv:2501.06882
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Quantum-Enhanced Dark Matter Search Using Cat States
First experimental deployment of four-component cat states in a high-Q superconducting cavity yields 8.1-fold signal enhancement and constrains dark photon kinetic mixing to ε < 7.32 × 10^{-16} near 6.44 GHz with 10^{-16} sensitivity over 100 kHz bandwidth.