Which-way detector unlocks some mystery of the double-slit experiment

From PhysOrg.com:

One of the greatest puzzles of the double-slit experiment – and quantum physics in general – is why electrons seem to act differently when being observed. While electrons traveling through a barrier with two slits create interference patterns when unobserved, these interference patterns disappear when scientists detect which slit each electron travels through. By designing a modified version of the double-slit experiment with a new “which-way” electron detector at one of the slits, a team of scientists from Italy has found a clue as to why electron behavior appears to change when being observed.



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