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Why cannot time be defined as an quantum observable ?

I would like to know where time fails as an quantum observable. I wonder this because if I defined time as a conjugated operator of energy I would have the form of time's operator but I don't where is the mistake of considering as an quantum observable


marked as duplicate by Dvij Mankad, By Symmetry, StephenG, Thomas Fritsch, Jon Custer Jun 21 at 16:05

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