Linked Questions

0
votes
1answer
430 views

Density of states of Photon [duplicate]

While obtaining the density of states of photons one multiple it with 2 for two polarization states, My question is that the whole calculation is based on quantum phenomena of light so why one uses ...
0
votes
1answer
171 views

Relation between spin and polarization of photon? [duplicate]

What is the possible spin configuration of photon? And does spin has any relation with polarization?
71
votes
8answers
15k views

Why is the $S_{z} =0$ state forbidden for photons?

If photons are spin-1 bosons, then doesn't quantum mechanics imply that the allowed values for the z-component of spin (in units of $\hbar$) are -1, 0, and 1? Why then in practice do we only use the $...
4
votes
5answers
2k views

Isn't all light polarised?

I apologize if my question does not make sense.(I'm teaching myself microscopy.) So reading Fundamentals of Light Microscopy and electronic imaging by Douglas&Murphy, at one point the author ...
1
vote
1answer
1k views

How does a rotation operator change the angular momentum of a quantum system?

I think I'm having some problems understanding the role of rotation operator $$\mathscr {R} = e^{-i/\hbar \hat{L_z} \theta}.$$ Suppose we have a quantum system in the state $\vert \psi_0 \rangle$ ...
4
votes
0answers
389 views

Confused by Malus Law

The well known Malus law predicts $\cos^2\theta$ for the probability of passing through a filter oriented with an angle $\theta$ w.r.t. the polarization direction of the incident photon. On the other ...
2
votes
1answer
228 views

Understanding the quantum physics behind light polarization

I'd like to help use the following exercise to reinforce my understanding of some basic concepts of quantum states. Here's a picture of the setup: Now, I'll try and make my series of questions about ...
0
votes
1answer
112 views

Quantum mechanics: compatible observables

I am confused about something. If (all what I will write are operators) $x$ is compatible with $p_y$ that means they have the same eigenvectors. However, $x$ is compatible with $y$ which means they ...
0
votes
1answer
155 views

Unpolarized light, spherical wavelets and Photons

Before I get to the core of my question, I would like clarify my understanding of unpolarized light. Below are 2 images of unpolarized light from Google: The first one seems to be in accordance with ...
1
vote
1answer
54 views

uncertinity principle in photon [duplicate]

Suppose I have a em wave train.How do I know how many photon does it contain?And where are the photons?(like in the middle or more toward the end of the wave train)The frequency of light that we get ...