It took some digging, but I've found an accessible copy of the article referenced.[1] It seems the heart of this system uses "balanced detectors" to do the opti

It took some digging, but I've found an accessible copy of the article referenced.[1] It seems the heart of this system uses "balanced detectors" to do the optical detection, allowing a lock. (Something I just learned exists) The rest is phase locked loops, something I already understand. [1] https://arxiv.org/ftp/arxiv/papers/2205/2205.01147.pdf https://arxiv.org/ftp/arxiv/papers/2205/2205.01147.pdf