Quantum ToolkitFactoriesNumberOn this pageNumber Number(integer i) -> OperatorFermiNamed Returns the fermionic number operator ni=fi†fin_{i} = f_{i}^\dagger f_{i}ni=fi†fi with support on the specified site. Parameters i: The site index where the operator acts. Example Number(3)*Fbit("0010") // Returns (0 + 0i)|0010>