Novel light dark matter detection with a quantum parity detector using qubit arrays

We present the design and the sensitivity reach of the qubit-based light dark matter detection experiment. We propose the novel two-chip design to reduce signal dissipation, with quantum parity measurement to enhance single-phonon detection sensitivity. We demonstrate the performance of the detector with full phonon and quasiparticle simulations. The experiment is projected to detect ≳ 30 meV energy deposition with nearly 100% efficiency and high energy resolution. The sensitivity to m χ ≳ 0.01 MeV dark matter scattering cross section is expected to be advanced by orders of magnitude for both light and heavy mediators, and similar improvements will be achieved for axion and dark photon absorption in the 0.04–0.2 eV mass range.