Figure 10
From: AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space
Space-time diagram of the operation of a pair of cold-atom interferometers based on single-photon transitions between the ground state (blue) and the excited state (red dashed). The laser pulses (wavy lines) travelling across the baseline from opposite sides are used to divide, redirect, and recombine the atomic de Broglie waves, yielding interference patterns that are sensitive to the modulation of the light travel time caused by DM or GWs (from [78]). For clarity, the sizes of the atom interferometers are shown on an exaggerated scale