On 10/19/2019 2:31 PM, John Clark wrote:
As long as the photon is still in transit if you erase the which way information you see a interference pattern and if you don't erase that information there is no interference pattern. And that is seriously weird and seriously interesting. If you wait to make the decision until after the picture is made the results are not weird at all and is in fact dull as dishwater because you'll learn nothing new that Thomas Young didn't discover in 1801 when he performed the 2 slit exparament for the very first time; when Young looked at his screen he also did not have any which way information and that's why he saw a interference pattern.
It's new (relative to 1801) that you can record the welcher weg so that the interference pattern doesn't appear on the screen. But then you can erase it after the pattern is already on the screen, and the interference pattern "reappears" in a sense, which you can see by partitioning the points according to the erasure result.
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