# Homework Help: Polarized light; maximum number of disagreements?

1. Nov 11, 2012

### xb4byish

Polarized light and their disagreements

Starting with 2 vertical photons, how can we argue that the maximum number of disagreements and minimum number for +30° and -30° is Nmin(-30°,30°) ≤ N(60°,0°) ≤ Nmax(-30°,30°)? and should we also not rotate the light?

2. Nov 11, 2012

Staff Emeritus
Re: Polarized light and their disagreements

What are you talking about?

3. Nov 12, 2012

### DrChinese

Re: Polarized light and their disagreements

Welcome to PhysicsForums, xb4byish!

I don't follow your question either. However, if by chance you are referring to entangled photons: they cannot be considered as vertically polarized.

4. Nov 13, 2012

### Staff: Mentor

What are Nmin(-30°,30°), N(60°,0°) and Nmax(-30°,30°)?

What do you mean with maximum number of disagreements? Maximal number of photon pairs where two detectors will see different orientations for both photons? That is just the number of photon pairs. The average number is more meaningful.

5. Nov 13, 2012

### xb4byish

perhaps its average number of disagreements. But i mean how can we prove the number of disagreements for (60,0) is between the minimum number of disagreements of (-30,0) and the maximum number of disagreements between the maximum number of disagreements of (30,0)

6. Nov 13, 2012

### Staff: Mentor

I don't understand that question.

There is an explicit formula for the "disagreement probability", you can derive it simply by looking at the 4 different cases. That should help.