## Description

Schrödinger equation solver 1D. User defined potential V(x). Diagonalization of hamiltonian matrix. Animation showing evolution in time of a gaussian wave-packet.

In Quantum Mechanics the one-dimensional Schrödinger equation is a fundamental academic though exciting subject of study for both students and teachers of Physics. A solution of this differential equation represents the motion of a non-relativistic particle in a potential energy field V(x). But very few solutions can be derived with a paper and pencil.

Have you ever dreamed of an App which would solve this equation (numerically) for each input of V(x) ?

Give you readily energy levels and wave-functions and let you see as an animation how evolves in time a gaussian wave-packet in this particular interaction field ?

Quantum Wave in a Box does it ! For a large range of values of the quantum system parameters.

Actually the originally continuous x-spatial differential problem is discretized over a finite interval (the Box) while time remains a continuous variable. The time-independent Schrödinger equation H ψ(x) = E ψ(x), represented by a set of linear equations, is solved by using quick diagonalization routines. The solution ψ(x,t) of the time-dependent Schrödinger equation is then computed as ψ(x,t) = exp(-iHt) ψ₀(x) where ψ₀(x) is a gaussian wave-packet at initial time t = 0.

You enter V(x) as RPN expression, set values of parameters and will get a solution in many cases within seconds !

- Atomic units used throughout (mass of electron = 1)
- Quantum system defined by mass, interval [a, b] representing the Box and (real) potential energy V(x).
- Spatially continuous problem discretized over [a, b] and time-independent Schrödinger equation represented by a system of N+1 linear equations using a 3, 5 or 7 point stencil; N being the number of x-steps. Maximum value of N depends on device’s RAM: up to 4000 when computing eigenvalues and eigenvectors, up to 8000 when computing eigenvalues only.
- Diagonalization of hamiltonian matrix H gives eigenvalues and eigenfunctions. When computing eigenvalues only, lowest energy levels of bound states (if any) with up to 10-digit precision.
- Listing of energy levels and visualisation of eigenwave-functions.
- Animation shows gaussian wave-packet ψ(x,t) evolving with real-time evaluation of average velocity, kinetic energy and total energy.
- Toggle between clockwise and counter-clockwise evolution of ψ(x,t).
- Watch Real ψ, Imag ψ or probability density |ψ|².
- Change initial gaussian parameters of the wave-packet (position, group velocity, standard deviation), enter any time value, then tap refresh button to observe changes in curves without new diagonalization. This is particularly useful to get a (usually more precise) solution for any time value t when animation is slower in cases of N being large.
- Watch both solution ψ(x,t) and free wave-packet curves evolve together in time and separate when entering non-zero potential energy region.
- Zoom in and out any part of the curves and watch how ψ(x,t) evolve locally.

## What’s New

Version 1.0.2

- Language: english (previously appeared mistakenly as french).
- Fixes an issue encountered when trying to access Photos.
- Optimisation of successive graphic actions for repeated taps on HOME button.

## Ratings and Reviews

2.0 out of 5
1 Rating

1 Rating

bendyboy76 ,

### Stopped working.

Used to work great. Now crashes when loading and dumps back to home screen in one second.

### Developer Response ,

Thanks for this feedback. When you update your device with a new release of iOS, the App may stop working. The code needs to be recompiled. This is what Apple does actually. I did download the App today and it works nice with the latest iOS 11.4. Even if it is still version 1.0.2 of Quantum Wave in a Box. I suggest you delete the App from your device then download it anew. Let me know if it solves the crashing problem and deserve maybe some additional stars.

## App Privacy

The developer, Michel Ramillon, has not provided details about its privacy practices and handling of data to Apple.

### No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

## Information

Seller
Michel Ramillon
Size
15.5 MB
Category
Education
Compatibility

Requires iOS 8.1 or later. Compatible with iPhone, iPad, and iPod touch.

Languages

English

Age Rating
4+