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Bell Gedanken Experiment Model
written by Juan María Fernández
The Bell Gedanken Experiment Model implements a simple 3D representation of Bell's adaptation of the Einstein-Podolsky-Rosen apparatus. A central source prepares a singlet state for two Spin 1/2 particles with a specified z-component. Each arm of the apparatus has Stern-Gerlach detectors that can be rotated about the y axis. The simulation  plots the data in a Up Up ?? pair number vs angle difference representation and compares the classical prediction to the quantum mechanical prediction for the expected value of  pairs.

The Bell Gedanken Experiment Model was developed using version 5 of the Easy Java/JavaScript Simulations (EjsS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.   Double clicking the jar file will run the program if Java is installed.  You can modify this simulation if you have EjsS installed by right-clicking within the map and selecting "Open Ejs Model" from the pop-up menu item.

Please note that this resource requires at least version 1.7 of Java (JRE).
2 supplemental documents are available
1 source code document is available
Subjects Levels Resource Types
Quantum Physics
- Entanglement and Quantum Information
- Foundations and Measurements
= Projection Operators
- Quantum Experiments
- Spin and Finite Dimensional Systems
= Polarization
- Upper Undergraduate
- Graduate/Professional
- Instructional Material
= Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Juan María Fernández
Record Creator:
Metadata instance created September 3, 2014 by Wolfgang Christian
Record Updated:
November 14, 2014 by Juan Maria Fernandez
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Record Link
AIP Format
J. Fernández, Computer Program BELL GEDANKEN EXPERIMENT MODEL (2014), WWW Document, (
J. Fernández, Computer Program BELL GEDANKEN EXPERIMENT MODEL (2014), <>.
APA Format
Fernández, J. (2014). Bell Gedanken Experiment Model [Computer software]. Retrieved December 15, 2017, from
Chicago Format
Fernández, Juan María. "Bell Gedanken Experiment Model." (accessed 15 December 2017).
MLA Format
Fernández, Juan María. Bell Gedanken Experiment Model. Computer software. 2014. Java (JRE) 1.7. 15 Dec. 2017 <>.
BibTeX Export Format
@misc{ Author = "Juan María Fernández", Title = {Bell Gedanken Experiment Model}, Year = {2014} }
Refer Export Format

%A Juan María Fernández
%T Bell Gedanken Experiment Model
%D 2014
%O application/java

EndNote Export Format

%0 Computer Program
%A Fernández, Juan María
%D 2014
%T Bell Gedanken Experiment Model

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Bell Gedanken Experiment Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Bell Gedanken Experiment Model.

relation by Wolfgang Christian
Is Supplemented By Bell Local Realistic Spin Model

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