Atomic spins set quantum fluid in motion The Einstein-de Haas effect has been observed in a quantum fluid, showing that changes in magnetization transfer angular momentum from atomic spins to collective motion. Experimental Realization of the Einstein–de Haas Effect in a Spinor-Dipolar Quantum Fluid. The experiment began by placing the condensate in a weak magnetic field of 1 microtesla, which aligned all atomic spins in the same direction. Using matter-wave interferometry, the researchers directly observed phase windings around these vortices, indicating that angular momentum was coherently transferred from atomic spins to quantized orbital angular momentum. This enables us to simultaneously capture the quantum state of the spins, the atomic motion, and the interactions linking them, and to track their time evolution based on quantum mechanics,” says Kozuma.