title: Strongly correlated quantum walks in optical lattices.
abstract: Full control over the dynamics of interacting, indistinguishable quantum particles is an important prerequisite for the experimental study of strongly correlated quantum matter and the implementation of high-fidelity quantum information processing. We demonstrate such control over the quantum walk-the quantum mechanical analog of the classical random walk-in the regime where dynamics are dominated by interparticle interactions. Using interacting bosonic atoms in an optical lattice, we directly observed fundamental effects such as the emergence of correlations in two-particle quantum walks, as well as strongly correlated Bloch oscillations in tilted optical lattices. Our approach can be scaled to larger systems, greatly extending the class of problems accessible via quantum walks.
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Philipp M
authors.initials: PM
authors.lastname: Preiss
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Ruichao
authors.initials: R
authors.lastname: Ma
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: M Eric
authors.initials: ME
authors.lastname: Tai
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Alexander
authors.initials: A
authors.lastname: Lukin
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Rispoli
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Philip
authors.initials: P
authors.lastname: Zupancic
authors.affiliation: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Yoav
authors.initials: Y
authors.lastname: Lahini
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: Rajibul
authors.initials: R
authors.lastname: Islam
authors.affiliation: Department of Physics, Harvard University, Cambridge, MA 02138, USA. greiner@physics.harvard.edu.
authors.forename: Markus
authors.initials: M
authors.lastname: Greiner