[PaulHoule]

Sounds like you should apply for a grant.

My hunch is you need very high information density to work, like the information density around the event horizon of a black hole.

[Jonghwa_Lee]

Spot on. An Event Horizon indeed represents the theoretical limit of information density (the Bekenstein bound).

Since I can't create one in the lab, I'm betting on GHZ states to generate a steep enough local information gradient to yield a measurable effect. It's a scale-down, but unlike a black hole, we can test it today.