I am a computer scientist specialising in quantum information processing.

I am currently struggling to understand the photonic setting in the figure below (coming from this paper).

enter image description here

I wonder how a standard generic input $\alpha|\texttt{0}\rangle + \beta|\texttt{1}\rangle$ -- figure (a) -- maps to what it looks to me as a fixed input of two EPR pairs $|\Phi^{\texttt{+}}\rangle \otimes |\Phi^{\texttt{+}}\rangle$ -- figure (b) --.

I am not really used to read photonic settings. E.g. I don't know what is meant for trigger, nor for $e_i, o_i$.

  • $\begingroup$ Welcome to SE. Perhaps this question would have better luck in the Quantum computing site. $\endgroup$
    – Miyase
    Jun 18, 2022 at 11:13
  • $\begingroup$ Thank you. It is indeed related to a question I posted there. But I think that this particular one finds a better audience here, where I assume there are some more experts on photonic settings. $\endgroup$ Jun 18, 2022 at 11:15
  • $\begingroup$ related by OP: quantumcomputing.stackexchange.com/q/26885/55 $\endgroup$
    – glS
    Jun 20, 2022 at 8:25
  • 1
    $\begingroup$ I'm not flagging this as outright cross-posting because you at least did make a few changes between the posts. Still, in such cases linking together the posts is appreciated. And as I said in the other post, I think you're better off asking more specific questions about aspects of this. If you lack the necessary background of how these circuits work, you might also have a hard time understanding the answers. For example, I'd focus on the equivalence in Fig. (c) here. Or on how a PBS works, if you don't know that, etc. $\endgroup$
    – glS
    Jun 20, 2022 at 8:35


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