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In this paper we present result of theoretical calculation of entanglement within a spin structure of Gd3N @C80 under the influence of rectangular impulses. Research is conducted using general spin Hamiltonian within SSNQ (spin system of N-qubits). Calculation of entanglement with variable impulse is performed using the time-dependent Landau-Lifshitz-Gilbert equation with spin-spin correlation function. We show that long rectangular impulse (t=850ps) can be used for maintaining of entanglement value. This allows us to offer a new algorithm which can be used to reduce the challenge of decoherence to logical scheme optimization.