Figure 2

Initialisation and computation sequence. (a) First, a trap volume is filled with atoms captured in a magneto-optical trap, and pre-cooled using Doppler cooling. (b) An atom absorbs momentum directed opposite to its velocity (top). Then, spontaneous emission of photons in an arbitrary directions leads to a net momentum transfer opposite the direction of travel of the atoms (bottom). The pre-cooled atoms are then trapped in a grid using optical technologies. Since the grid positions are filled with non-unit probability, fluorescence imaging is used to detect filled positions (c), the occupied positions are moved into adjacent positions (d). After applying the desired sequence of one- and two-qubit gates (e), the final qubit states are read using a collective imaging measurement (f)