A gentleman on youtube called Tom Campbel, PhD, claims the following. If we perform the double slit experiment with 2 kinds of detectors, one which records the which path information about the particle and another that detects the pattern formed by the particles in the screen, something very unusual would happen:
If we looked at the screen detector alone, we would see a clump pattern, because there exists data, information, on the which path part of the experiment.
If we looked at the which path device alone, it would show data regarding which path each particle took.
If we looked at none, the result would remain uncertain.
If we would let the which path recording device sealed away for 100 years, never examining it's data, and in the mean time we'd never look at the screen pattern device, and if, 100 years later, we were to completely destroy the information recorded in the which path device so it could never, ever be recovered, when we looked at the daata f the screen pattern it would show an interference pattern, instead of a clump pattern, even though we tood the information on which path. but since we completely and utterly erased that information without first observing it, the which way measurement would be like it never existed in the first place, because there isn't data anywhere in the universe of what it recorded.
Is there any truth to this?
Could any of you conduct such an experiment (no need for the 100 years, but absolute need for the complete destruction of the information in the which path measurement device. Is that even possible? to completely destroy information?)