English

Noncommutative Heisenberg-Robertson-Schrodinger Uncertainty Principles

General Mathematics 2025-02-10 v1

Abstract

Let E\mathcal{E} be a Hilbert C*-module over a unital C*-algebra A\mathcal{A}. Let A:D(A)EEA: \mathcal{D}(A) \subseteq \mathcal{E} \to \mathcal{E} and B:D(B)EEB: \mathcal{D}(B)\subseteq \mathcal{E}\to \mathcal{E} be possibly unbounded self-adjoint morphisms. Then for all xD(AB)D(BA)x \in \mathcal{D}(AB)\cap \mathcal{D}(BA) with x,x=1\langle x, x \rangle =1, we show that \begin{align*} (1) \quad \quad \quad \Delta _x(B)^2d_x(A)^2+\Delta _x(A)^2d_x(B)^2\geq \frac{(\langle \{A,B\}x, x \rangle -\{\langle Ax, x \rangle,\langle Bx, x \rangle\})^2-(\langle [A,B]x, x \rangle +[\langle Ax, x \rangle,\langle Bx, x \rangle])^2}{2} \end{align*} and \begin{align*} (2) \quad \quad \quad \quad \Delta _x(A)\Delta _x(B)\geq \frac{\sqrt{\|(\langle \{A,B\}x, x \rangle -\{\langle Ax, x \rangle,\langle Bx, x \rangle\})^2-(\langle [A,B]x, x \rangle +[\langle Ax, x \rangle,\langle Bx, x \rangle])^2\|}}{2}, \end{align*} where Δx(A):=AxAx,xx\Delta _x(A):= \|Ax-\langle Ax, x \rangle x \|, dx(A):=Ax,AxAx,x2d_x(A):= \sqrt{\langle Ax, Ax \rangle -\langle Ax, x \rangle^2}, [A,B]:=ABBA[A,B] := AB-BA, {A,B}:=AB+BA\{A,B\}:= AB+BA, {Ax,x,Bx,x}:=Ax,xBx,x+Bx,xAx,x\{\langle Ax, x \rangle,\langle Bx, x \rangle\}:= \langle Ax, x \rangle\langle Bx, x \rangle +\langle Bx, x \rangle\langle Ax, x \rangle, [Ax,x,Bx,x]:=Ax,xBx,xBx,xAx,x[\langle Ax, x \rangle,\langle Bx, x \rangle]:= \langle Ax, x \rangle\langle Bx, x \rangle -\langle Bx, x \rangle\langle Ax, x \rangle. We call Inequalities (1) and (2) as noncommutative Heisenberg-Robertson-Schrodinger uncertainty principles. They reduce to the Heisenberg-Robertson-Schrodinger uncertainty principle (derived by Schrodinger in 1930) whenever A=C\mathcal{A}=\mathbb{C}.

Keywords

Cite

@article{arxiv.2502.05154,
  title  = {Noncommutative Heisenberg-Robertson-Schrodinger Uncertainty Principles},
  author = {K. Mahesh Krishna},
  journal= {arXiv preprint arXiv:2502.05154},
  year   = {2025}
}

Comments

6 Pages, 0 Figures