All Questions
Tagged with coherence quantum-optics
21
questions
12
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2
answers
2k
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Why is laser light described by a coherent state?
This is a follow-up to this recent answer by Wouter to this related question from 2015, and a comment by Emilio Pisanty underneath.
I have read the papers by Mølmer, Bartlett et al., Wiseman, and ...
- 1,347
6
votes
2
answers
497
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Optical coherence versus quantum coherence
Optical coherence is usually defined to be the measure of statistical correlation (for example if the phase difference is constant) of a pair of waves.
Recently I came across the notion of quantum ...
- 1,723
6
votes
1
answer
1k
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How can sub- and super-Poissonian statistics be distinguished from bunching and antibunching?
This is my first post here, so I apologize if there's something wrong.
I am studying quantum optics and I found myself in trouble with the difference between bunching/antibunching and super poissonian/...
- 896
3
votes
3
answers
794
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Is the energy of single photon defined by uncertainty relation? What is the pulse duration of sigle photon beam?
Coherent sources can have ultra short pulse durations provided there is at least one photon in frequency that span broad bandwidth (and are coherent)?
Does that mean that the pulse duration is ...
- 1,047
3
votes
2
answers
526
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Degree of first-order coherence doesn't imply always 100% visibility?
In classic books of quantum optics visibility of interference fringes (for example in Michelson interferometer) is equal to the modulus of the degree of first order coherence $g^{(1)}$, when the ...
- 896
2
votes
1
answer
720
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Squeezed vacuum state
From:
Loudon, Rodney. The quantum theory of light. OUP Oxford, 2000.
Consider the single-mode quadrature-squeezed vacuum state defined by
$ | \zeta \rangle = \hat{S} (\zeta) | 0 \rangle $
where the ...
- 444
2
votes
1
answer
612
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Physical significance of effective wave function
In Yanhua Shih's book on quantum optics, the coherence functions are expressed in terms of effective wave function. Here are the expressions for single photon wave packets.
To derive the coherence ...
- 422
2
votes
0
answers
36
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What does it imply when we say that the waves are perfectly correlated?
I am having a hard time understanding difference between correlation and coherence. I got a nice answer for coherence here- Are two waves being in phase is the same as saying that the two waves are ...
2
votes
0
answers
114
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The importance of optical period in coherent radiation
I am reading a text on coherent radiation and not quite understanding a particular statement. To provide some background, the authors state that coherent radiation can arise from light-matter ...
- 649
2
votes
0
answers
210
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How is the temporal coherence of a pulse defined?
I am having problem with the concept of coherence and photon degeneracy.
The temporal coherence of pulse is defined in Born and Wolf as:
$$t_c=\lambda^2/c\Delta\lambda$$
(The time a photon takes to ...
- 1,047
1
vote
2
answers
88
views
Gaining Quantum information without destroying the coherence
I've read about new optical interference among several telescopes all around the globe. It is supposed to work by combining the quantum states of a photon A arriving at once in every telescope of the ...
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1
vote
1
answer
69
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How to scale Poissonian light?
In quantum optics, coherent light with constant frequency, phase, and amplitude shows poissonian photon number statistics:
$$P(n) = \frac{\bar{n}^{n}}{n!}e^{-\bar{n}}.$$
A well-known result for ...
- 35
1
vote
2
answers
336
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Quantum and non-equilibrium properties of the radiation, emitted by "thermal light sources"
Free photon gas
Let us consider different thermal light sources, such as the Sun, an incandescent lamp, or a fluorescent bulb. In elementary quantum mechanics and statistical physics one describes the ...
- 60.3k
1
vote
1
answer
121
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State emitting from an extended thermal source
This calculation is for a double slit experiment setup which is experiencing a far field radiation from an extended monochromatic thermal source. I assume the source is 1-D and it's length is $b$. ...
- 422
1
vote
0
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Coherence, Correlation and causality in Quantum Field Theory
I've started to study in details quantum optics and I find difficulties in linking the concepts of coherence and correlation among fields, especially because I'm building right now a background on ...
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