New applications of the formula A|ψ〉=〈A〉|ψ〉+ΔA|ψ⊥〉 are discussed. Simple derivations of the Heisenberg uncertainty principle and of related inequalities are presented. It is also shown that a state corresponding to a maximal uncertainty of any given observable cannot be unique.
Topics
Uncertainty principle
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© 1996 American Association of Physics Teachers.
1996
American Association of Physics Teachers
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