Quantum wave impedance calculation for an arbitrary piesewise constant
potential
- URL: http://arxiv.org/abs/2010.06263v1
- Date: Tue, 13 Oct 2020 10:06:17 GMT
- Title: Quantum wave impedance calculation for an arbitrary piesewise constant
potential
- Authors: O. I. Hryhorchak
- Abstract summary: The general form of a wave function of bound states for an arbitrary piesewise constant potential was obtained as well as transmission and reflection coefficients in a scattering case.
The applying of method was demonstarted on the system of double well/barrier.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The method of a determination of a quantum wave impedance for an arbitrary
piecewise constant potential was developed. On the base of this method both the
well-known iterative formula \cite{Khondker_Khan_Anwar:1988} and alternative
ways for a quantum wave impedance calculation were derived. A scattering and a
bound state case were considered. The general form of a wave function of bound
states for an arbitrary piesewise constant potential was obtained as well as
transmission and reflection coefficients in a scattering case. The applying of
method was demonstarted on the system of double well/barrier.
Related papers
- Quantum Circuits for the heat equation with physical boundary conditions via Schrodingerisation [33.76659022113328]
This paper explores the explicit design of quantum circuits for quantum simulation of partial differential equations (PDEs) with physical boundary conditions.
We present two methods for handling the inhomogeneous terms arising from time-dependent physical boundary conditions.
We then apply the quantum simulation technique from [CJL23] to transform the resulting non-autonomous system to an autonomous system in one higher dimension.
arXiv Detail & Related papers (2024-07-22T03:52:14Z) - Quantum simulation of the Fokker-Planck equation via Schrodingerization [33.76659022113328]
This paper studies a quantum simulation technique for solving the Fokker-Planck equation.
We employ the Schrodingerization method-it converts any linear partial and ordinary differential equation with non-Hermitian dynamics into systems of Schrodinger-type equations.
arXiv Detail & Related papers (2024-04-21T08:53:27Z) - On the validity of the rotating wave approximation for coupled harmonic oscillators [34.82692226532414]
We solve the dynamics analytically by employing tools from symplectic geometry.
We find that the squeezing present in the full Hamiltonian and in the initial state governs the deviation from the approximated evolution.
We also show that the rotating wave approximation is recovered for resonant frequencies and vanishing coupling to frequency ratio.
arXiv Detail & Related papers (2024-03-22T16:51:53Z) - A Lie Algebraic Theory of Barren Plateaus for Deep Parameterized Quantum Circuits [37.84307089310829]
Variational quantum computing schemes train a loss function by sending an initial state through a parametrized quantum circuit.
Despite their promise, the trainability of these algorithms is hindered by barren plateaus.
We present a general Lie algebra that provides an exact expression for the variance of the loss function of sufficiently deep parametrized quantum circuits.
arXiv Detail & Related papers (2023-09-17T18:14:10Z) - Determination of the critical exponents in dissipative phase
transitions: Coherent anomaly approach [51.819912248960804]
We propose a generalization of the coherent anomaly method to extract the critical exponents of a phase transition occurring in the steady-state of an open quantum many-body system.
arXiv Detail & Related papers (2021-03-12T13:16:18Z) - Bernstein-Greene-Kruskal approach for the quantum Vlasov equation [91.3755431537592]
The one-dimensional stationary quantum Vlasov equation is analyzed using the energy as one of the dynamical variables.
In the semiclassical case where quantum tunneling effects are small, an infinite series solution is developed.
arXiv Detail & Related papers (2021-02-18T20:55:04Z) - Analytical representation of an iterative formula for a quantum wave
impedance determination in a case of a piecewise constant potential [0.0]
An analytical solution for a quantum wave impedance in a case of piesewise constant potential was derived.
The application of obtained results was illustrated on a system of double-well/barrier structures.
arXiv Detail & Related papers (2020-10-20T07:15:32Z) - Numerical study of quantum mechanical systems using a quantum wave
impedance approach [0.0]
It was proved that the approximation of a real potential by a piesewise constant function is also reasonable in a case of using a quantum impedance approach.
The dependence of an accuracy of numerical calculations on a number of cascads by which a real potential is represented was found.
arXiv Detail & Related papers (2020-10-16T08:48:57Z) - Application of a quantum wave impedance method for study of infinite and
semi-infinite periodic media [0.0]
It was shown how to reformulate the problem of an investigation of mentioned systems in terms of a quantum wave impedance.
The illustation of such a simplification was provided by application of classical approach, transfer matrix technique and a quatum wave impedance method for solving Kronig-Penney model.
arXiv Detail & Related papers (2020-10-15T09:58:08Z) - Application of a quantum wave impedance method for zero-range singular
potentials [0.0]
An application of a quantum wave impedance method for a study of quantum-mechanical systems is considered.
Both the scattering and bound states problems are solved for systems of single $delta$, double $delta$ and single $delta-delta'$ potentials.
arXiv Detail & Related papers (2020-10-14T10:18:02Z) - Reformulation of a transmission and reflection problems in terms of a
quantum wave impedance function [0.0]
The advantages of this approach were discussed and demonstrated for a case of a single rectangular barrier.
The expressions for a reflection and a transmission coefficient were found on the base of a quantum wave impedance approach.
arXiv Detail & Related papers (2020-10-09T17:05:10Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.