# Questions tagged [quantum-optics]

A branch of atomic, molecular, and optical physics dealing with how individual quanta of light, known as photons, interact with atoms and molecules. It includes the study of the particle-like properties of photons.

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### What is an electro-optic switch?

I found an implementation of a CNOT in photonic QC and I just couldn't find any info on a component named "electro-optic switch" What does it do exactly? How does it work? The ...
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### How to build a single-photon emitter at home

Hey any of you people know if it's possible to make a DIY single-photon emitter? I've been searching for an answer for quite some time now and all I've come across that's helpful is this: https://www....
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### In (O'Brien et al. 2004), why is the target qubit not affected when the control is $\vert 0\rangle$?

I'm currently reading this paper https://arxiv.org/abs/quant-ph/0403062 but I fail to understand how the input of the control qubit affects the output of the target qubit. I do understand that when ...
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### Sidebands in spin-oscillator coupled devices

I am researching spin-oscillator hybrid devices (particularly those coupled to NV centers), and I have come across this paper investigating the strain field of a cantilever and its effect on the NV ...
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### How is the third-order autocorrelation measured in quantum optics?

The third order autocorrelation is defined as $$\bar g^{(3)} = \frac{\langle \hat a^\dagger \hat a^\dagger\hat a^\dagger \hat a\hat a\hat a\rangle}{\bar n^3}.$$ How is this quantity measured in ...
I was solving steady state solution given by Lindblad equation, and I got stuck on the calculation part like what will be the value of $\langle e, 0|b, 0\rangle$? And how should I rewrite \$|d, 0\...