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3 votes

Renormalisation in quantum optics

In quantum optics, the calculations usually only involve tree level diagrams, which does not require renormalisation. Such calculations are only relevant when considering nonlinear interactions. In ...
flippiefanus's user avatar
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1 vote
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What is the physical meaning of Floquet quasi-energy? (to a near-layman)

Well, without periodic driven system, we originally have eigenfrequencies and eigenstates. Once, the periodic drive is on, the eigenstates becomes Floquet states or quasi-states. So you should have ...
Yi-Ming's user avatar
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2 votes

Why does the Lamb-Dicke parameter decrease with the number of ions in an ion chain

The Lamb-Dicke (LD) parameter is a measure of how efficiently light couples to motion (phonons) in a chain of trapped ions. The higher LD is, the faster you can do a multi-qubit gate rotation and more ...
KF Gauss's user avatar
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0 votes

Trying to learn input-output formalism: 2-photon Fock state entering a cavity

The central point to note is that input-output theory is not always easy practically. In particular, one cannot straightforwardly specify the full quantum state because the equations are in the ...
Wolpertinger's user avatar
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1 vote

Why does the Lamb-Dicke parameter decrease with the number of ions in an ion chain

Consider a chain of $N$ singly charged ions, each with mass $m$. The Lamb-Dicke parameter $\eta_{ip}$ for exciting an ion $i$ of mass $m$ with mode $p$ with laser is given by $\eta_{ip}=\vec{k}\cdot\...
Nhung Nguyen's user avatar
0 votes

Linearity of Lindblad equation in the Heisenberg picture

Quadratic Lindbladian operators have been investigated extensively for the first time by Toma┼ż Prosen and his collaborators. He calls his approach third quantization because it amounts to write the ...
lcv's user avatar
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3 votes

Linearity of Lindblad equation in the Heisenberg picture

The "Heisenberg picture" evolution for Lindblad equations does not play nicely with the operator product: if $C=AB$ and you know the solution for the two operators $A(t)$ and $B(t)$, ...
Mark Mitchison's user avatar
0 votes

The relativity of simultaneity in two-photon absorption

Is the concept of simultaneous absorption relative to the lab observer or the atom's center of mass (CM)? Either way, it doesn't matter. All reference frames agree when things happen at the same time ...
Dale's user avatar
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