A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description.
Questions tagged [quantum-optics]
1221 questions
7
votes
3 answers
Quantization of arbitrary electromagnetic field
Quantum optics all discuss the quantization of free electromagnetic radiation. The result is well established.
But what about an arbitrary electromagnetic field? For example, the simplest case, electric field generated by a point charge. How is that…
Siyuan Ren
- 4,932
4
votes
1 answer
What causes the collective emission in Dicke Model?
Dicke model is a collection of two level atoms prepared in the excited state, when the wavelength of the light absorbed or emitted is very large compared to the distance between the atoms, the rate at which radiation emitted is proportional to…
FearlessVirgo
- 624
- 6
- 25
3
votes
1 answer
How do I show that squeeze states are non-classical?
I am trying to show that squeezed states are non classical by showing that the Glauber-Sudarshan $P$ function takes negative values. A squeezed state is one for which one of the quadratures $\Delta X_1 < \frac{1}{2}$. In Introductory quantum optics…
Hermitian_hermit
- 3,826
3
votes
2 answers
What is the meaning of coherent decay rate and population decay rate?
In quantum optics, especially the part when talking about atom-light interaction, there are two different kinds of decay rate, coherent decay rate $\gamma_{ij}$ where $i$ and $j$ are atomic energy states, and population decay rate $\Gamma_{ij}$.
I…
TBBT
- 2,727
2
votes
1 answer
How does second-order coherence remain unchanged by loss whereas photon statistics deteriorate in general?
I read an argument that the second-order coherence remains unaffected by loss. This is true because loss can always be modeled by the action of lossless beam-splitters in series, and it can be verified from the definition of the second-order…
Girish Kulkarni
- 732
2
votes
0 answers
What are the typical values for squeezed states of light?
Which range of values of the squeezing parameter is achievable with today's technology ?
eternalstudent
- 91
- 5
2
votes
1 answer
which is the state if I add a photon to a coherent state of the light?
Imagine a situation in which I introduce a photon of frequency w, described by the state $|1\rangle$ in a cavity previously filled by radiation in a coherent state $|\alpha\rangle$. My question is, which the final state of the system?
My problem to…
P. Salas
- 21
2
votes
0 answers
Spontaneous emission, Rabi, Jaynes Cummings, damped Jaynes Cummings, spectral densities
I am currently slightly confused on the different models that exists to treat the interaction of a two-level system with a radiation field.
Currently, I understood that there are several models.
Rabi Model
The interaction of a two-level system…
Martin
- 153
2
votes
0 answers
Spontaneous emission in homogeneous medium
According to https://en.wikipedia.org/wiki/Spontaneous_emission#cite_note-9, the spontaneous emission rate in homogenous non-dispersive medium with refractive index $n$ is given by
$\Gamma = n\left( \frac{\omega^3 |\mu_{12}|^2}{3\pi\epsilon_0\hbar…
ErwinNK
- 253
2
votes
0 answers
Quantum optical master equation
In Quantum Noise by Gardiner and Zoller (p. 86f) they derive and write a version of the quantum optical master equation.
$ \dot{\rho}_S (t) = -\frac{i}{\hbar} [H_\mathrm{sys} ,\rho_S] - \sum_m \frac{\pi \omega_m}{2\hbar } \bigg( \bar{N}(\omega_m)…
HansHarhoff
- 305
2
votes
0 answers
Why the plots of a second-order intensity correlation function appear both Bunching and Antibunching?
This second-order correlation function is calculated based on a single atom in a cavity, driven by classical light source,under the condition of two photons resonance.
When I plotted it in Mathematica, I found that when the two-photon resonance is…
1
vote
1 answer
The Solution to the Milburn Master Equation:
I'm studying the Milburn's method for solving the master equation, which is of the form:
\begin{equation}
\frac{\partial}{\partial t} \hat{\rho}(t) = -\iota[\hat{H}, \hat{\rho}(t)] - \frac{\gamma}{2}[\hat{H}, [\hat{H},…
1
vote
0 answers
Theoretical criterion for single photon sources
I am having a question regarding the theoretical classifications of a single photon source. Normally, this is accounted by finding values in the second order correlation function $g^{(2)}(0)$ as low as possible.
An issue with this classification is…
1
vote
1 answer
Partial measurement of a Two-Mode Squeezed Vacuum state
It seems that if you measure a quadrature on the first mode, let's say $\hat{q}$, on a TMSVS, the second mode will collapse into a coherent state $|q+it\rangle$ Is this true ? What is then the value of $t$ ?
eternalstudent
- 91
- 5
1
vote
1 answer
What interferes in an astronomical interferometer?
As I understand it, in an astronomical interferometer, both telescopes need to be aimed at the same light point in space to get an interference pattern. But I also understand that a single photon cannot be detected at two points simultaneously; it…
