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arXiv 2209.05293math-phmath.MPnlin.SIquant-ph
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非常曲率空间中量子非线性振子的Shannon信息熵

Shannon information entropy for a quantum nonlinear oscillator on a space of non-constant curvature

Angel Ballesteros, Ivan Gutierrez-Sagredo

摘要:

达布III振子是定义在具有非常数负曲率的径向对称空间上的精确可解的$N$维非线性振子。这个振子可以被解释为通常的$N$维谐振子在一个非负参数$λ$下的光滑(超)可积变形,该参数与底层空间的曲率直接相关。本文详细研究了量子形式的达布Ⅲ型振子的香农信息熵,分析了熵与曲率之间的相互作用。特别地,在$N$维情况下,可以得到位置空间中Shannon熵的解析结果,在曲率消失极限$λ\to 0$下,恢复了$N$维谐振子量子态的已知结果.然而,达布III波函数的傅里叶变换不能精确计算,从而阻碍了动量空间中信息熵的分析研究。然而,我们已经计算了后者的数值在一维和三维的情况下,我们发现,通过增加的绝对值的负曲率(通过一个较大的$λ$参数)的信息熵在位置空间增加,而在动量空间变得更小。这一结果确实与该量子非线性振子的波函数的扩展性质一致,这是明确显示的。位置和动量空间中的熵之和也用曲率来分析:对于所有激发态,总熵随$λ$减小,但对于基态,当$λ$消失时,总熵最小,并且总是满足相应的不确定关系。

英文摘要:

The so-called Darboux III oscillator is an exactly solvable $N$-dimensional nonlinear oscillator defined on a radially symmetric space with non-constant negative curvature. This oscillator can be interpreted as a smooth (super)integrable deformation of the usual $N$-dimensional harmonic oscillator in terms of a non-negative parameter $λ$ which is directly related to the curvature of the underlying space. In this paper, a detailed study of the Shannon information entropy for the quantum version of the Darboux III oscillator is presented, and the interplay between entropy and curvature is analysed. In particular, analytical results for the Shannon entropy in the position space can be found in the $N$-dimensional case, and the known results for the quantum states of the $N$-dimensional harmonic oscillator are recovered in the limit of vanishing curvature $λ\to 0$. However, the Fourier transform of the Darboux III wave functions cannot be computed in exact form, thus preventing the analytical study of the information entropy in momentum space. Nevertheless, we have computed the latter numerically both in the one and three-dimensional cases and we have found that by increasing the absolute value of the negative curvature (through a larger $λ$ parameter) the information entropy in position space increases, while in momentum space it becomes smaller. This result is indeed consistent with the spreading properties of the wave functions of this quantum nonlinear oscillator, which are explicitly shown. The sum of the entropies in position and momentum spaces has been also analysed in terms of the curvature: for all excited states such total entropy decreases with $λ$, but for the ground state the total entropy is minimised when $λ$ vanishes, and the corresponding uncertainty relation is always fulfilled.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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