A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description.
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Optical Tunneling
Is there light tunneling taking place in optically transparent mediums like glass? wherein light travels a larger path in these mediums without interacting with atoms and without any change in ...
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1answer
60 views
Types of photon qubit encoding
How many types of qubit encoding on photons exist nowadays? I know only two:
Encoding on polarization:
$$ \lvert \Psi \rangle = \alpha \lvert H \rangle + \beta \lvert V \rangle $$
$$ \lvert H ...
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1answer
70 views
Measuring the quantum state of light
A clarification please
The following scheme to measure linear polarization states (a single polarizing beam splitter and two photo counters) orientation (as $arctan \sqrt{\frac{v}{h}}$) of coherent ...
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1answer
88 views
Using wavepackets instead of photons in quantum computer
Why does a photonic quantum computer require photons? Why wouldn't wave packets work just as well, better in fact since it would get away from the use of fragile single photons? (Article)
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1answer
89 views
Optical waveguide that can displace a 4D light field
Has anyone invented an optical waveguide that can "pipe" a scene from one place to another unaltered? More precisely, I want to displace (and/or rotate) a 4D light field.
An optical waveguide is an ...
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1answer
155 views
Quantum Cryptography
First question was a little bit ambiguous.
Photons are passed through a linear polarizer that is oriented $\theta$ degrees again the photon passes through another linear polarizer that also have a ...
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1answer
27 views
Relationship between photon polarization and photon angular momentum
What direction is the angular momentum of right hand polarized light points to? Is it vertical to its propagating direction? I want to recognize this in quantum theory.
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1answer
51 views
double slit experiment with two opposite quarter waveplates
Consider the usual double slit experiment involving laser and a double slit and a screen. Now place in front of the left slit a quarter waveplate (let's call it QWP1) that changes a certain linear ...
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30 views
Why is low temperature required for optical lattice systems to enter magnetic regime?
"Optical lattice requires a very low temperature scale to enter magnetism regime."
Why is that?
What I know:
optical lattice systems suppress kinetic energy (hopping parameter: $t$ small);
...
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77 views
How to calculate radiative transition rate of exciton in a quantum dot with specific dimension?
I am writing rate equations for a nanophotonic system including three quantum dots. I need to calculate that radiative transition rates of exciton in ground state in those quantum dots.
In the paper ...
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53 views
fiber optic second order PMD as an operator on the tensor product Hilbert space
Second order polarization mode dispersion (SOPMD) is a coupling mechanism between polarization and frequency. Take our photon to be the following tensor product:
$\psi = \int \gamma_{\omega} | ...
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50 views
What characterizations are available for two-photon Bell state light sources?
It is often technologically important to know how photon statistics change over time when a light source is turned on. A light source that comes to full intensity/visibility in a nanosecond after it ...
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226 views
Are virtual photons affected by effective gravity in non-linear quantum electrodynamics?
Quantum electrodynamics based upon Euler-Heisenberg or Born-Infeld Lagrangians predict photons to move according to an effective metric, which is dependent on the background electromagnetic field in a ...
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937 views
Explanation of the experiment with Mach–Zehnder interferometer (self-interference of a single photon)
Here is the description of experiment which uses Mach–Zehnder interferometer
http://en.wikipedia.org/wiki/Mach-Zehnder
or
http://departments.colgate.edu/physics/research/Photon/root/ajpbs02.pdf
...
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2answers
442 views
quantum optics of a polarizing beam splitter
I would like to use the Heisenberg picture in quantum field theory to model a polarizing beam splitter. Is there an easy way for someone to show me how the field operators ($a^\dagger_{input1}$, ...
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1answer
266 views
What is the spectral energy density of virtual photons around a unit charge at rest?
Given that my previous question, namely "What is the number density of virtual photons around a unit charge?" has no precise answer, here is a more precise wording:
What is the virtual photon ...
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62 views
quantum field description of squeezing
Following with a series of questions regarding quantum squeezing, let me add another one: quantum squeezing of vacuum is a real propagating state of the field, it can be switched on and off, squeezing ...
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Excitation probability for 2 Level Atom
I currently started learning Quantum Optics using the book "Atom Physics" of Christopher Foot. Currently I am working through Chapter 7 and a question occured concerning the intuitively physical ...
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31 views
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 ...
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1answer
52 views
First order coherence through double slit
The state $$|\Psi \rangle = |0\rangle + \sum_j \int d\omega f_j(\omega)\hat{a}^\dagger_j (\omega) |0\rangle $$ is coming from a far field and incident on a double slit setup. Here j is the index of ...
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9 views
Image formation [duplicate]
What is the real cause behind the formation of an image? It is explained as" when rays of light focus at a point image is formed." So here we have two events, one focusing of light and another ...
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1answer
82 views
Stark effect in two level atomic system
In a two level atomic system ( rabi oscillating problem) the perturbative potential is oscillating / sinusoidal because it comes from the electric field from the laser.
Now stark effect is the ...
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39 views
Photon detection rate for pure / mixed states coming from single mode point source
Let the pure states be in superposition of horizontal and vertically polarized basis states. They are arriving at the point detector one at a time. So, a pure state is $|\Psi\rangle = \alpha|V\rangle ...
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76 views
How can the 5-photon absorption coefficient be estimated?
Imagine a large bandgap material which is irradiated by an intense laser beam.
If the photon energy is only high enough for 1/5 of the bandgap, is there a way to approximate the absorption by 5-photon ...
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102 views
Polarization photon and Stokes parameters
I have the following situation: About the polarization of the photon, I introduce the basis:
Horizontal polarization $|\leftrightarrow>=\binom{1}{0}$
Vertical polarization ...
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74 views
Is Photonics going to be the next phase in Electronics? Considering the recent Nobel Prize 2012 award for Physics [closed]
Photonics seems to be a rather closed field involving only specialists and experts working on it. Will there be a period which is going to define the power of Photonics in which Electronics is ...
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204 views
Intensity of the diffraction pattern of the double slit
I am trying another approach for my last unanswered question. (Bounty still on for 3 days. Anyone? Please?) Note that this is not the same question but a greatly simplified version concerning a much ...
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103 views
Atomic Coherence(Polarization) of Two Dipole-Dipole Coupled Atoms
My question is about generalization of most simple problem in semi-classical quantum optics. Composite system of two-level systems.
single system's diagram
where atomic frequency: wab=wa - wa; ...
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1answer
90 views
How to estimate number of Laue Spot
Why are "Laue Spots" spots instead of rings? Or is there an effective way to estimate the number of Laue spots? I can't find any formulas or theory concerning this issue. Thanks for your attention!
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64 views
polarization - quantum point of view
polarization could be easily imagined in classical model: direction of E vector. is there any simple image for polarization of single photon?
