Zeros of Rydberg-Rydberg Foster Interactions

Abstract

Rydberg states of atoms are of great current interest for quantum manipulation of mesoscopic samples of atoms. Long-range Rydberg-Rydberg interactions can inhibit multiple excitations of atoms under the appropriate conditions. These interactions are strongest when resonant collisional processes give rise to long-range C_3/R^3 interactions. We show in this paper that even under resonant conditions C_3 often vanishes so that care is required to realize full dipole blockade in micron-sized atom samples.

10 pages, 4 figures, submitted to J. Phys. B

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• Engineering single atom and single photon sources from entangled atomic ensembles
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