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We investigate a long-range interaction between $64D_{5/2}$ Rydberg-atompairs and antiblockade effect employing a two-color excitation scheme. Thefirst color (pulse A) is set to resonantly excite the Rydberg transition andprepare a few seed atoms, which establish a blockade region due to stronglong-range interaction between Rydberg-atom pairs. The second color (pulse B)is blue detuned relative to Rydberg transition and enables further Rydbergexcitation of atoms by counteracting the blockade effect. It is found that afew seed atoms lead to a huge difference of the Rydberg excitation with pulseB. The dynamic evolution of antiblockade excitation by varying the pulse-Bduration at 30-MHz blue detuning is also investigated. The evolution resultreveals that a small amount of seed atoms can trigger an avalanche Rydbergexcitation. A modified superatom model is used to simulate the antiblockadeeffect and relevant dynamic evolution. The simulations are consistent with theexperimental measurements.

Observation of many-body dynamics of Rydberg atoms based on antiblockade using two-color excitation