Exciting ultracold atoms into highly-excited Rydberg states extends the cold atom toolbox by long-range interactions. Rydberg macrodimers - electrostatically bound Rydberg atom pairs - provide bond lengths as large as the distances between different lattice sites in an optical lattice. Optical excitation rates of macrodimers are enhanced if the distance and orientation of the prepared ground state atom pairs match the motional state of the macrodimer state and are suppressed otherwise.
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