A Digital Twin of a Green Machine built with MZI's and internal modulators to compensate for errors.
A useful demo to see how the MZIs are affected by internal errors can be seen here. a, b represent the input and ouput couplers, while p is a phase modulator inside of the MZI and q is a phase modulator on one output arm. The final model is composed of many of these MZIs.
Here's an example correction that was possible with this code, using biases of 40/60 coupling (a, b), random internal phase errors between each layer on the order of 0-pi/6, each layer losses of .2 dB, additional modulator loss of .3 dB, and small additional random errors on each bidirectional coupler (a, b) with a standard deviation of 1% coupling. The two images show power coupling between input and output ports before and after modulator corrections, respectively
Creates a digital twin with random imperfections. Uses an iterative optimizaiton method to correct these errors using the on chip modulators. Run this script (takes about an hour on my laptop)
Creates the cirucit structure, defines MZI equations, etc.
Useful functions to build an programmable chip / green machine (using a Bokun or a Clements model, see this paper). Also includes quality functions to evaluate performance and functions to process s parameters from simphony.