Linked Questions

0
votes
1answer
672 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
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1answer
284 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?
91
votes
8answers
20k 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 $...
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5answers
3k 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 $\vert \psi_0 \rangle$ ...
3
votes
1answer
388 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 ...
4
votes
0answers
458 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 ...
0
votes
1answer
261 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
478 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
62 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 ...
0
votes
1answer
34 views

Beam splitters and quantum mechanics

Suppose two incoming photons one coming from the axis x and the other from the y axis, both in the positive direction of this axes. Now suppose we put a beam splitter in the origin, oriented with 45° ...