No, that's a different, more complex experiment. This is just about adding a detector to one of the slits so you can tell which slit each electron is passing th

No, that's a different, more complex experiment. This is just about adding a detector to one of the slits so you can tell which slit each electron is passing through. Here is a more complete explanation: https://phys.org/news/2011-01-which-way-detector-mystery-double-slit.html https://phys.org/news/2011-01-which-way-detector-mystery-dou... The delayed choice quantum eraser is a much more complex experiment.