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Based on my limited layman's science: Photons are quantum sized light particles with no mass that behave both as particles and waves. As light they travel in straight trajectories unless influenced by a massive gravitational field (the "boomerang" remark in the article particularly caught my eye). And like radar, if they hit a reflective surface it seems to make sense they would bounce back at light speed and be detectable.

But I am not really sure why they could not be "absorbed" by a dark surface coating on whatever you're trying to protect from detection. No return ... no comparison of elements of the beam when it left, with what the same quantum nuggets look like when they get back.

This sounds like something that could work in a lab under very strictly controlled conditions but might be years away from functioning in the real world. In the meantime, if it screws up our stealth tech it screws up everybody else's as well.

It all changes when you look at entanglement ~ theoretically you can split a photo pair (they're always paired) and bing one of the pair off to somewhere else and simply watch the one nearer to see whas' hoppen!

There've been some stories about pairing up more than 2 photons ~ so that might be what this is about. It's all too secret for anybody to talk about except in the most hush hush tones, and then only limited to what you would find in a textbook.

Sure, this would beat the devil out of radar ~ and, best news possible, say you can pair 100,000,000 photons, and zip zap them past the aircraft skin and simply evaporate the pilot or other control system ~ somebody will come up with grant money for that!