https://github.com/strilanc/bell-tester

An interactive JavaScript/html widget for trying classical and quantum strategies in the CHSH bell test game.
https://github.com/strilanc/bell-tester

Last synced: 12 months ago
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An interactive JavaScript/html widget for trying classical and quantum strategies in the CHSH bell test game.

• Host: GitHub
• URL: https://github.com/strilanc/bell-tester
• Owner: Strilanc
• License: apache-2.0
• Created: 2015-09-21T06:17:32.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2015-10-11T17:58:26.000Z (over 10 years ago)
• Last Synced: 2024-04-14T23:21:29.386Z (about 2 years ago)
• Language: JavaScript
• Homepage:
• Size: 344 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Bell Tester

[![Build Status](https://travis-ci.org/Strilanc/Bell-Tester.svg)](https://travis-ci.org/Strilanc/Bell-Tester)

An interactive javascript widget that allows you to try custom classical and quantum strategies for [violating bell inequalities in the CHSH game](https://en.wikipedia.org/wiki/CHSH_inequality).

Also includes a no-communication theorem tester.

Screenshot of beating the test in the quantum strategy widget:

![quantum strategy beating the test](README_screenshot.png)

**Building**

Use Node.js commands to transpile and concatenate the javascript code into a single 'all_src.js' file in `out/`. The html and other resources are also copied into `out/` when building. Opening the `index.html` in `out/` with a browser after building should give a working instance of the widget.

To install dependencies used during building:

    npm install

    npm install -g grunt-cli

To run the unit tests (attempts to run the tests on both Chrome and Firefox, so those need to be installed):

    npm test

To generate a working version of the widget in `out/`:

    npm run build

**The CHSH game**

- Two players, A and B, come up with a plan and are then separated

- Each player is given the result of a coin flip (c_a, c_b) (but not the other player's coin flip)

- Each player chooses a boolean value (m_a, m_b) (while still separated and knowing only one coin flip)

- The game is won iff (c_a AND c_B) == (m_a XOR m_b)

Classical strategies can't expect to win more than 75% of the time, whereas quantum strategies with pre-shared entanglement can get past 85%.

**Interaction**

The widget works by taking two pieces of javascript code, one for each player, that assign a value to a variable `move` based on variables `refChoice` and `sharedMoves`.

(It *should* be difficult to craft malicious javascript that wins by corrupting the game, because the move-choosing code is sandboxed into separate web workers, but feel free to surprise me.)