  Following the simple observation that the interconnection of a set of quantum
optical input-output devices can be specified using structural mode VHSIC
Hardware Description Language (VHDL), we demonstrate a computer-aided schematic
capture workflow for modeling and simulating multi-component photonic circuits.
We describe an algorithm for parsing circuit descriptions to derive quantum
equations of motion, illustrate our approach using simple examples based on
linear and cavity-nonlinear optical components, and demonstrate a computational
approach to hierarchical model reduction.
