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Return the potential operator in the dual basis of arXiv:1706.00023

grid (Grid): The discretization to use. spinless (bool): Whether to use the spinless model or not. non_periodic (bool): If the system is non-periodic, default to False. period_cutoff (float): Period cutoff, default to grid.volume_scale() ** (1. / grid.dimensions).

operator (FermionOperator)