Trap for the Invisible: How to Catch Dark Matter ⚡ экспресс
A hybrid detector has been proposed to hunt for ultralight dark matter—axions or dark photons—with masses around a millielectronvolt. The setup marries a dielectric haloscope (which turns dark matter into terahertz photons), a cloud of rubidium atoms (which boosts the signal to optical frequencies), and a superconducting single-photon nanodetector. The atomic converter's razor-sharp frequency window and directionality work as a 'filter' that wipes out thermal noise. The projected sensitivity nudges right up to the level predicted by quantum chromodynamics, cracking open the terahertz window in particle astrophysics.
Dark matter is an invisible mass holding galaxies together. Its nature remains unknown, but one likely candidate is the axion — an ultra-light particle that barely interacts with matter. To catch it, physicists built a hybrid trap.
The trap consists of a layered transparent resonator. As an axion flies through it, with a tiny probability it transforms into a photon of invisible terahertz radiation. The layers amplify this moment many times. Then rubidium atoms, bloated to gigantic sizes (Rydberg atoms), catch that photon and emit a visible flash. A superconducting nanowire at the output registers even a single quantum. After 10 days of measurements, the detector will probe axions at the level predicted by the quantum theory of strong interactions — QCD axions. This would be the first direct contact with dark matter.
🎯 The name 'axion' was inspired by a laundry detergent brand: physicists hoped the particle would 'wash away' inconsistencies in the theory.