Delayed choice is NOT REAL! Watch, or read, this: http://backreaction.blogspot.com/2021/10/the-delayed-choice-quantum-eraser.html http://backreaction.blogspot.c

Delayed choice is NOT REAL! Watch, or read, this: http://backreaction.blogspot.com/2021/10/the-delayed-choice-quantum-eraser.html http://backreaction.blogspot.com/2021/10/the-delayed-choice-... Basically the results of two slits with particles combine into no pattern. If you retroactively keep track of which slit, and then only look at that slit, it makes a pattern.