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Rydberg blockade sphere persists an intriguing picture by which a number ofcollective many-body effects caused by the strong Rydberg-Rydberg interactionscan be clearly understood and profoundly investigated. In the present work, wedevelop a new definition for the effective two-atom blockade radius and showthat the original spherically shaped blockade surface would be deformed whenthe real number of atoms increases from two to three. This deformation ofblockade sphere reveals spatially anisotropic and shrunken properties whichstrongly depend on the interatomic distance. In addition, we also study theoptimal conditions for the Rydberg antiblockade effect and make predictions forimproving the antiblockade efficiency in few-atom systems.

Anisotropic deformation of Rydberg blockade sphere in few-atom systems