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.
Kang,et al., Scalable architecture for dark photon searches: Superconducting-qubit proof of principle (2025), arXiv:2503.18315
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A protocol using squeezed states in 2D ion crystals in a Penning trap achieves super-Heisenberg sensitivity for axion-like particles, dark photons, and high-frequency gravitational waves while accounting for decoherence.
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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.
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Super-Heisenberg protocol for dark matter and high-frequency gravitational wave search
A protocol using squeezed states in 2D ion crystals in a Penning trap achieves super-Heisenberg sensitivity for axion-like particles, dark photons, and high-frequency gravitational waves while accounting for decoherence.