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Plastino, Angelo; Bellomo, Guido; Ricardo Plastino, Angel
Advances in Mathematical Physics, 01/2015, Letnik: 2015Journal Article
Fisher’s information measure I plays a very important role in diverse areas of theoretical physics. The associated measures I x and I p , as functionals of quantum probability distributions defined in, respectively, coordinate and momentum spaces, are the protagonists of our present considerations. The product I x I p has been conjectured to exhibit a nontrivial lower bound in Hall (2000). More explicitly, this conjecture says that for any pure state of a particle in one dimension I x I p ≥ 4 . We show here that such is not the case. This is illustrated, in particular, for pure states that are solutions to the free-particle Schrödinger equation. In fact, we construct a family of counterexamples to the conjecture, corresponding to time-dependent solutions of the free-particle Schrödinger equation. We also conjecture that any normalizable time-dependent solution of this equation verifies I x I p → 0 for t → ∞ .
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