Search for axion-like dark matter with spin-based amplifiers

Understand

Ultralight axion-like particles (ALPs) are well-motivated dark matter candidates introduced by theories beyond the standard model.

• However, the constraints on the existence of ALPs through existing laboratory experiments are hindered by their current sensitivities, which are usually weaker than astrophysical limits.
• Here, we demonstrate a new quantum sensor to search for ALPs in the mass range that spans about two decades from 8.3 feV to 744 feV.
• Our sensor makes use of hyperpolarized long-lived nuclear spins as a pre-amplifier that effectively enhances coherently oscillating axion-like dark-matter field by a factor of >100.