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Comment on "Asking Photons Where Have They Been"
We argue that, in the recent letter by A. Danan et al. [PRL 111, 240402
(2013), arXiv:1304.7469], if weak measurements are performed such that complete
destructive interference is not disturbed, claims such as "some photons have
been inside the inner interferometer but they never entered and never left"
should not arise. Standard quantum mechanics not only explains the physics
better than the two-state vector formulation the authors advocate, but it can
tell a very different story.Comment: One figure added supporting our claim that rotating mirrors A and B
at exactly the same frequency, but out of phase, restores complete
destructive interference. Minor changes made in order to make our main
argument cleare
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