Linked Questions

23 votes
13 answers
10k views

If a photon truly goes through both slits (at the same time), then why can't we detect it at both slits (at the same time)?

I am not asking about whether the photon goes through both slits, or why. I am not asking whether the photon is delocalized as it travels in space, or why. I have read this question: Do we really ...
Árpád Szendrei's user avatar
71 votes
7 answers
8k views

What's the physical meaning of the statement that "photons don't have positions"?

It's been mentioned elsewhere on this site that one cannot define a position operator for the one-photon sector of the quantized electromagnetic field, if one requires the position operator have ...
knzhou's user avatar
  • 103k
23 votes
2 answers
3k views

EM wave function & photon wavefunction

According to this review Photon wave function. Iwo Bialynicki-Birula. Progress in Optics 36 V (1996), pp. 245-294. arXiv:quant-ph/0508202, a classical EM plane wavefunction is a wavefunction (in ...
Jia Yiyang's user avatar
  • 3,995
8 votes
8 answers
758 views

If turning a perfectly monochromatic laser on for a finite time gives a frequency spread, where did the other frequency photons come from?

I changed again the mind experiment to avoid any explanation involving doppler effect or nonlinear interaction I expressed the same problem under a different angle but it will probably make the ...
StarBucK's user avatar
  • 1,450
12 votes
2 answers
2k views

Why doesn't there exist a wave function for a photon whereas it exists for an electron?

A photon is an excitation or a particle created in the electromagnetic field whereas an electron is an excitation or a particle created in the "electron" field, according to second-quantization. ...
Saurabh Shringarpure's user avatar
7 votes
7 answers
979 views

Effect of wavelength on photon detection

When some photon detector detects a photon, is it an instantaneous process (because a photon can be thought of as a point particle), or does the detection require a finite amount of time depending on ...
Chris Laforet's user avatar
4 votes
2 answers
566 views

photon wave function, double slit, single photon source

There's an old argument by Newton and Wigner, that the photon as a massless particle can't have a position operator and therefore no position space wave function. How does this tie in with the double ...
Fritz's user avatar
  • 83
0 votes
1 answer
831 views

Why do objects above absolute zero start emitting electromagnetic radiation in infrared light first rather than radio or microwave?

I have a very rudimentary understanding of electromagnetic radiation and how it corresponds to temperature. It is my understanding that any object above absolute zero first starts emitting radiation ...
user177107's user avatar
1 vote
3 answers
579 views

Does it make sense to think about shot noise in single-photon detectors?

I am looking into the noise considerations of a single photon detector, specifically an avalanche detector. I am wondering if it makes sense to think about shot noise when considering a single photon. ...
Kyle's user avatar
  • 13
1 vote
1 answer
191 views

How does electric and magnetic field interchanges in light propagation? [closed]

We know that magnetism is just a illusion created because of special relativistic effects and there is only electric field which is really there in reality. so how can we say that this imaginary ...
user210956's user avatar
  • 1,278