The universe is a hologram concept was conceived to explain how information that is sucked into a black hole can perpetuate. Consider this. You are next to a black hole. I am beside you. You get sucked inside. I know you are inside because I am outside and you are inside. That’s real, right?
No. I cannot know because when you or light or anything disappear into a black hole so does the information about you. It’s like a Jasper Fford novel. You’ve been edited out of existence.
So, this is an experiment to see if there is another possible explanation, a hologram one. It relies on measuring these things that are 10 quadrillionth times smaller than the width of a proton.