Microwave shielding of ultracold NaRb molecules

Recent years have witnessed tremendous progresses in creating and manipulating ultracold polar molecules. However, the two-body loss even without chemical reactions is still a hurdle for many future explorations. In this work, we investigate the loss suppression of bosonic NaRb molecules with a circular polarized microwave which can induce a long-range barrier via the resonant dipolar interaction and prevent molecules from reaching the short range and undergoing lossy collisions. We demonstrate suppression of the loss by over two orders of magnitude with the lowest two-body inelastic rate coefficient reaching 1×10^(-12) cm^3/s. The elastic-to-inelastic collision ratio is improved to around 1000, which should be enough for observing efficient evaporative cooling.