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.
(c) At the end of the wait time, the qubit state entangled with the cavity state|𝜙 𝑗 ⟩accumulates a phase of𝑗 𝜋/2, as depicted by the arrows along the𝑥- and𝑦-axes
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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.