Thank you for your replies, they have spurred my thinking.
I now think a fundamental part of my question was buried in my assumptions at the bottom of the original posting. I can rephrase my question as follows:
If photons A & B are entangled, and photon A is absorbed, does that cause...
Allow me to create a scenario and ask questions first, then subsequently make an admission of ignorance.
Assume we create a device (the source or repeater) that produces two beams of entangled photons at a steady, pulsing rate. Each beam is focused on a target at a far-away station. The...