Quantum-Enhanced Searches for Axion Dark Matter

Over the last several decades, there have been many attempts to directly detect the invisible mass density known as "dark matter" in galaxies and galaxy clusters. Detection techniques vary widely based on the dark matter candidate and the availability of sensing technologies. The advent of sub-quantum-limited sensors has been particularly impactful in searches for the axion, a wave-like dark matter candidate that originally emerged in solutions to the strong CP problem in particle physics. Many of these searches have driven development and served as testbeds for current state of the art developments in quantum sensing. In this talk, we give an overview of searches and highlight the unique role of quantum devices in the search for dark matter.