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reverse the result again. From a matrix perspective, it means X⋅X⋅|0⟩=|0⟩ or X²⋅|0⟩=|0⟩. In other words X²=I where I is called Identity Matrix Let us see this from Linear Algebra point of view: import numpy as np # Notice that we are creating the v0 matrix using the transpose operation v0 =