Single-site addressing in optical lattices
Ultracold quantum gases in optical lattices have evolved in the last years into an interdisciplinary tool for many-body solid state and quantum physics. To fully exploit the possibilities of such a system for quantum computing, we need to detect and to manipulate individual atoms on their lattice sites - a feature that was missing so far in this type of experiments.
High resolution images of a Mott insulator
The possibility to detect and to manipulate the atoms individually on their lattice sites allows the conception of an entirely new generation of experiments in the fields of quantum information and quantum simulation. It will be possible to observe and to manipulate density, spin structure, and correlations at the scale of a lattice site. By directly counting the number of atoms on the individual lattice sites, we can measure the statistics of site occupancy, both in the superfluid and in the Mott insulator phases, and detect imperfections such as doubly occupied sites or vacancies.
Using this new tool, we propose to investigate steady-state and dynamical properties of low-dimensional systems, which could not be detected by the conventional time-of-flight images. We plan to engineer fast, high-fidelity, quantum gates using Rydberg states or collisions in a spin-dependent lattice and to create massively entangled systems as a resource for quantum computation.