We know that in the double slit experiment, the reading out of the 'which route' information will destroy the interference pattern.
But the reading out of the 'which route' information can be achieved by an interaction free measurement based strategy, which means that the location of the particle can be detected in an interaction-free style. I mean here that the 'which route' information is regarded as the quality of the bomb in the quantum bomb tester so that its location can be read out by the interaction free mechanism.
I am wondering, in such a setup, will the reading out of the 'which route' information also destroy the interference pattern?
A quantum computation circuit based analysis shows that the interference pattern is destroyed. But what's interesting is that even the 'interaction free measurement' has not been carried out(no photon is sent in the bomb tester to read out the information), the interference pattern is also destroyed. So it seems that even an intention to read out the information(by just setting up a bomb tester behind a slit) will destroy the interference pattern.
As shown in the following picture, the particle of the double slit experiment (an electron with blue circle) passes one of the slits and the interaction free bomb tester tests the existence of the electron behind each slit using photons(red dots). This is somehow similar with the delayed choice experiment.