Quantum Parity Detectors: a qubit based particle detection scheme with meV thresholds for rare-event searches
Abstract: The next generation of rare-event searches, such as those aimed at determining the nature of particle dark matter or in measuring fundamental neutrino properties, will benefit from particle detectors with thresholds at the meV scale, 100-1000x lower than currently available. Quantum parity detectors (QPDs) are a novel class of proposed quantum devices that use the tremendous sensitivity of superconducting qubits to quasiparticle tunneling events as their detection concept. As envisioned, phonons generated by particle interactions within a crystalline substrate cause an eventual quasiparticle cascade within a surface patterned superconducting qubit element. This process alters the fundamental charge parity of the device in a binary manner, which can be used to deduce the initial properties of the energy deposition. We lay out the operating mechanism, noise sources, and expected sensitivity of QPDs based on a spectrum of charge-qubit types and readout mechanisms and detail an R&D pathway to demonstrating sensitivity to sub-eV energy deposits.
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