kromem, 1 year ago

One of the key points that the “it’s just mechanical interactions, bro” crowd should be more aware of though are the quantum eraser variations (not the delayed choice quantum eraser).

There is still something rather bizarre about mechanical interactions that measure which path information being sufficient to collapse on their own but suddenly insufficient when something like polarization which erases which path information is added back in later in the chain.

Also, it’s worth declaring when giving an answer like this that you are operating under the assumptions of QFT, and that this isn’t necessarily for sure what’s going on. For example, I’d imagine there’s Bohemian mechanics adherents still around somewhere that would take issue with your “it doesn’t exist as a single point in spacetime until it’s measured.”