Figure 4
From: Trapped modes in linear quantum stochastic networks with delays
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1140%2Fepjqt%2Fs40507-016-0041-9/MediaObjects/40507_2016_41_Fig4_HTML.gif)
A physical interpretation of a single Blaschke-Potapov term. Here the \(V_{k}\) represents a beamsplitter and the \(A_{k}\) represents a passive SISO system with a single degree of freedom. The zero-pole interpolation generates a series of factors of this form in a cascade.