Experimental realizations of bosonic dipolar quantum walks in optical lattice

Understanding emergent phenomena in strongly correlated system is one of the most important questions in physics. When it comes to quantum many-body systems, it is always challenging to understand interacting systems, especially understand their non-equilibrium dynamics. In this talk, I will discuss our recent demonstration of dipolar quantum walks using Rb atoms in optical lattice. Using linear tilting potential, we experimentally realize tilted Bose-Hubbard model, in which dipolar Bose-Hubbard model arises as an effective model. We experimentally observe quantum dynamics of finite density of bosons, which is an example of a fully interacting many-body nonequilibrium quantum dynamics. Using optical lattice, we observe constrained dynamics with a prethermal behavior due to emergent dipole conservation from a strong tilting potential. Despite that the dynamics is fully quantum and interacting in nature, the dynamics have a succinct description in term of quantum walks of emergent dipolar particles. I will highlight similarities and differences between the usual quantum walk and the dipolar quantum walk, and the experimental demonstration of the dipolar quantum walks in optical lattice. ​