We report the crystallographic determination of Gd₂@C₇₉N for the first time. This molecular magnet with a collective high-spin ground state (S = 15/2) generated by strong magnetic coupling (J_Gd-Rad = 350 ± 20 cm^–1) has been unambiguously validated by magnetic susceptibility experiments. Gd₂@C₇₉N has quantum coherence and diverse Rabi cycles, allowing arbitrary superposition state manipulation between each adjacent level. The phase memory time reaches 5 μs at 5 K by dynamic decoupling. This molecule fulfills the requirements of Grover’s searching algorithm proposed by Leuenberger and Loss.