Polarizer material experiment @ see 15:00 to 16:00 into the video below

—– 0 deg |  —- 90 deg | = nothing comes out.

—– 45 deg | —– 0 deg |  —– 90 deg | = ~nothing comes out.  I am calling the leakage "0"

 —– 0 deg |  —– 90 deg | —– 45 deg | = ~nothing comes out.

 —– 0 deg | —– 45 deg | —– 90 deg |  = 1/4 intensity 

1/4 intensity is due to electric field vector being diminished 2 times by square root of 2. Electric field is thus 1/2 and intensity will be the square of this at a value of 1/4.  

Later in the talk Garrett uses a polarization rotator. This takes the output of one orthogonal polarizer and spins it 90 degrees so that it aligns with the second polarizer giving no relative loss to a single sheet of polarizer material.  A single sheet of course has a loss of 1/2 when fed with unpolarized light. See image below.

 

 

David Mermin's "Stuff Left Behind" in terms of Von Neuman entropy.

It is highly recommend you watch David Mermin's "Stuff Left Behind" presentation before you watch this presentation.  Mermin's work is like chapter 1 and this is like chapter 2.

Ron Garrett aka Erann Gat quantum video on quantum mechanics.   It helps make quantum mechanics more clear by using very accessible experiments that use light as the test subject.

 

Research Links

• David Mermin's "Stuff Left Behind" presentation
• Erann Gat Website
• Ron-Garret-QM  – local copy in case removes  PDF version of the presentation done in 2001
• Quantum Eraser Experiment
• Double Slit Quantum Eraser – Walborn et al – 
• Wikipedia: Von Neumann Entropy
• Local Copy: Quantum Mechanics of Measurement  N. J. Cerf, C. Adami – Original location
• Quantum Entanglement of Photons demonstrated in relatively low cost set up – The presentation included here has simple explaination and experimental setup.
• Boojums All the Way Through is a collection of essays that presents the dilemma of communicating modern physics to both physicists and nonphysicists
• Home Made Quantum Eraser Experiment Using Laser 2 Slits Polarizer Material
• Two Slit Experiment with Quantum Eraser Realized with RF Components

Von Neumann Entropy

Where lambda are eigenvalues of the system.  Very similar to Shannon entropy but I suppose with complex values.

Notes

• The polarizer experiments that he shows are quite interesting.  
• This  presentation builds on David Mermin presentation is like a second chapter to that
• The 3 particle correlation shown near the end is the David Mermin "Stuff Left Behind" presentation