The superconducting cloud chamber detects charged particles and millicharged dark matter, suggesting new detection methods.
We propose a new particle-trajectory detector composed of Josephson junctions, named the superconducting cloud chamber. By measuring the quantum phase difference, this device can detect charged particles with extremely low kinetic energy, providing a new method for detecting slow-moving particles. It can also be utilized to detect millicharged dark matter particles thermalized with the Earth's environment within the mass range of 10⁴~ 10¹⁰\,GeV.
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Gao et al. (2025) studied this question.
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