1. Introduction
Rényi, Tsallis, and Shannon information entropies, and Onicescu information energy, are all global quantum information-theoretic measures (GQITM). These measures are focused on quantifying the spread of the probability distribution that characterizes the permitted quantum mechanical states of a system [
1,
2,
3,
4,
5]. The importance of these global measures is to study the uncertainty of the probability distribution [
6,
7,
8,
9,
10,
11,
12,
13].
These theoretical techniques have been widely used in atomic and molecular systems, and they provide excellent insight into density functionals and electron correlation, which assists in the study of atomic structure and dynamics [
14,
15,
16,
17,
18]. Quantum information theory (QIT) has acquired a lot of traction recently and has piqued the interest of many scholars. It has also proven to be incredibly useful in a variety of domains ranging from physics, chemistry, biology, medicine, computer science, neural networks, image recognition, linguistics, and other social sciences [
19,
20,
21,
22].
This is because QIT has a connection to current quantum communications, computing, and density functional techniques, which are the underlying theories and building blocks for a number of technological advances [
18,
19,
20]. The quantification of information is a sub-discipline of applied mathematics, physics, and engineering. Nonetheless, these metrics, as well as the uncertainty relations that go with them, are essential factors in identifying a variety of atomic and molecular processes [
21,
22]. In quantum physics, they are commonly utilized to study quantum entanglement [
22,
23], quantum revivals [
23,
24], and atomic ionization characteristics [
25]. This study has been done by several scholars for various quantum mechanical systems [
25,
26,
27,
28,
29,
30,
31,
32,
33,
34,
35,
36,
37,
38].
Olendski [
39] studied the Shannon quantum information entropies, Fisher informations, and Onicescu energies and complexities both in the position and momentum spaces for the azimuthally symmetric two-dimensional nano-ring that is placed in uniform magnetic and Aharonov–Bohm fields. Olendski [
40] calculated the one-parameter functionals of the Rényi and Tsallis entropies both in the position and momentum spaces for the azimuthally symmetric 2D nano-ring that is placed into the combination of the transverse uniform magnetic field and the Aharonov–Bohm (AB) flux and whose potential profile is modeled by the superposition of the quadratic and inverse quadratic dependencies on the radius r.
We are interested in investigating information-theoretical measures for the CYP in the presence of magnetic and Aharonov–Bohm fields in the current work. Onate and Ojonubah were the first to propose this potential [
41]. Since it is a generalization of the Yukawa, Hellmann, Coulomb, and inverse quadratic Yukawa potentials, this atomic model is important [
41,
42]. CYP has a wide range of applications in physics, including high-energy physics, atomic and solid-state physics, and many more [
43,
44]. The CYP is expressed as [
41]:
where
is the interparticle distance,
, and
are the potential parameters, and
is the screening parameter which characterizes the range of the interaction [
41].
In this study, we are looking for answers to the following questions: what happens to information-entropies when magnetic and Aharonov–Bohm fields have an all-encompassing effect? What happens when a lone effect occurs? As a result, we are interested in using information-theoretical measurements to investigate this spreading in both position and momentum spaces.
GITM are measures of uncertainty and information of a probability distribution and are useful in identifying strong variations on the distribution over a small region in a system; thus, they identify the local changes in the probability density, giving a good description of the quantum system [
9,
45].
The Shannon entropy is extended by the Rényi entropy. It is a single-parameter entropy measure family that has some important link with Shannon entropy. In the position space, Rényi entropy is defined as [
2,
27,
28,
46]:
For the momentum space coordinate, the associated Rényi entropy is given as:
where
. The parameter’s permissible range of values is governed by the integral’s convergence condition in the definition, with the crucial condition
. In the limit
, the Rényi entropy changes to the Shannon entropy [
34].
As
approaches zero, the Rényi entropy increasingly weighs all events with nonzero probability more equally, regardless of their probabilities. In the limit for
, the Rényi entropy is just the logarithm of the size of the support of
. The limit for
is the Shannon entropy. As
approaches infinity, the Rényi entropy is increasingly determined by the events of highest probability [
34].
Onicescu proposed a better measure of dispersion distribution in an attempt to establish a generalization to the Shannon entropy [
5]. Onicescu information energy is described as [
5]:
For the momentum space coordinate, the equivalent Onicescu energy is given as:
The probability distribution is more concentrated and the information content is smaller as the Onicescu information energy increases. The energy product of Onicescu can thus be calculated as .
In the position and momentum space coordinates, the Tsallis entropy is defined as [
4]:
and:
where
is the entropic moments. In the limit
, the Tsallis entropy also changes to the Shannon entropy. In Equations (2)–(7):
is a non-negative dimensionless coefficient, which can be construed as a factor describing the reaction of the system to its deviation from the equilibrium;
is the position space probability density; and
is the momentum space probability density.
The following is how this article is structured: the normalized wave function and probability density for the CYP in the presence of magnetic and Aharonov–Bohm fields are presented in the next section. The numerical findings and explanations of the Rényi entropy, Tsallis entropy, and Onicescu information energy, as well as their respective uncertainty relations, are presented in
Section 3. A final remark is made in
Section 4.
2. The Model Formulation
In cylindrical coordinates, the Hamiltonian operator of a charged particle moving in the class of Yukawa potential (CYP) under the combined influence of AB and external magnetic fields may be expressed [
47,
48,
49] as:
where
denotes the energy level,
is the effective mass of the system, and the vector potential which is denoted by “
” is given as:
[
47,
48].
Equation (8) cannot be solved analytically, so Greene and Aldrich approximation scheme have to be employed in order to obtain the eigen solutions [
46]. The energy is obtained as follows using the functional analysis approach (FAA):
where
is the magnetic quantum number:
and:
The normalized wave function
that corresponds to the two lowest lying states
are presented as follows:
and:
where
.
The normalized momentum-space
wave function for the two lowest lying states
, are obtained as [
39,
40]:
Full details of the solutions can be found in ref. [
50]. We point out here that Edet and Ikot [
50] have recently treated one of these global information entropies known as the Shannon entropy. In a bid to broaden the scope of our application, we will in the next section consider other global entropies.
In the absence of magnetic and AB fields, if we set
, and
, we recover the Kratzer–Feus potential:
with energy:
The above expressions (16) and (17) are in agreement with Ref. [
51].
3. Global Information-Theoretic Measures for the CYP
In general, the derivation of these information entropies is difficult and time-consuming, particularly the analytical formulation for the Tsallis and Rényi entropies and Onicescu information energy in momentum space. This is due to the Fourier transform’s intricate computation; as a result, we find the numerical result.
Figure 1a–d displays the plot of Tsallis entropies in position and momentum space, which reveals that the CYP’s position Tsallis entropies diminish as the potential parameter increases, whereas the momentum space expands when the potential parameter
is amplified. In the position space with rising magnetic and AB fields, Tsallis entropy is likewise shown to decrease. In the momentum space, the opposite is the case.
The Rényi entropies (RE) in position and momentum space are shown in
Figure 2a–d. RE increases with rising potential parameter
and decreases with the increasing magnetic and AB fields in position space. RE gets larger with the screening parameter
and is inversely proportional to magnetic and AB fields in momentum space. This behaves similarly to the Shannon entropies in position space seen in Figure 1a–d in Ref. [
51].
The Onicescu information energy (OIE) in position and momentum space is shown in
Figure 3a–d. The OIE in position space increases as the screening parameter
upsurges and declines as the magnetic and AB fields rise. The OIE reduces as the screening parameter rises and upsurges as the magnetic and AB fields grow in momentum space. This highlights the fact that the greater the system’s OIE, the more concentrated the probability distribution is and the smaller the information content. According to the definition of the Shannon entropy, more localized distributions and position space probability density correspond to the smaller value of the RE, which means that the delocalization of the probability density increases with increasing quantum number.
The numerical findings in
Table 1 and
Table 2 demonstrate that the position-space Tsallis entropy reduces as the potential parameter, magnetic, and AB fields rise, whereas the momentum-space Tsallis information entropy grows as the potential parameter
, magnetic, and AB fields increase. This is consistent with what we observed in
Figure 1. The single influence of these fields is examined in
Table 3. The Tsallis entropy in the position space grows as the potential parameter
increases when just the magnetic field is present, and a similar condition is observed in the momentum space. This contradicts our findings for the all-inclusive impact in momentum space. This finding is also confirmed when only the AB field is functioning.
The numerical results in
Table 4 and
Table 5 demonstrate that the position-space Rényi entropy decreases as the potential parameter, magnetic, and AB fields increase, but the momentum-space Rényi information entropy increases as the potential parameter
, magnetic, and AB fields increase. This is consistent with what we saw in
Figure 2.
When we looked at the lone influence of these fields on the Rényi entropy in
Table 6, we saw something intriguing. When just the magnetic field is active, we find that the Rényi entropy in the position space grows as the potential parameter rises, but the opposite is true in the momentum space.
This is in contrast to what we saw in the overall impact. The Rényi entropy in the position space reduces as the potential parameter
grows when just the AB field is active, but the opposite is true in the momentum space. This supports our observation of the all-encompassing influence. However, we may deduce that the magnetic is necessary to produce a rising Rényi entropy with regard to the potential parameter
. This finding is comparable to what the Shannon entropy shows [
50]. It is important to realize that the conjugates of position and momentum space information entropies have an inverse relationship with each other. A strongly localized distribution in the position space corresponds to widely delocalized distribution in the momentum space.
The numerical results in
Table 7 and
Table 8 demonstrate that the position-space Onicescu information energy surges as the potential parameter
, magnetic, and AB fields rise, whereas the momentum space Onicescu information energy information entropy reduces as the potential parameter
, magnetic, and AB fields rise. When we looked at the single influence of these fields on the Onicescu information energy in
Table 9, we discovered something interesting. When just the magnetic field remains operational, the Onicescu information energy in the position space drops as the potential parameter
rises, although in the momentum space the opposite is the case.
This contrasts our findings in the case of the comprehensive impact. When just the AB field is present, we notice that the Onicescu information energy in the position space grows as the potential parameter increases, but the opposite is true in the momentum space. This is consistent with our findings in the case of the all-inclusive effect. However, we could deduce that the AB field is necessary to acquire a rising Onicescu information energy in position space with regard to the potential parameter.