When photons are lying about where they have been

Abstract

The past of the photon in a nested Mach-Zehnder interferometer with an inserted Dove prism is analyzed. It is argued that the Dove prism does not change the past of the photon. Alonso and Jordan correctly point out that an experiment by Danan et al. demonstrating the past of the photon in nested interferometer will show different results when the Dove prism is inserted. The reason, however, is not that the past is changed, but that the experimental demonstration becomes incorrect. The explanation of a signal from the place in which the photon was (almost) not present is given. Bohmian trajectory of the photon is specified.

6 pages, 3 figures; revised and expanded version

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Cited by in corpus (7)

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• Understanding quantum mechanics: a review and synthesis in precise language
• Photons are lying about where they have been, again
• On the Validity of Weak Measurement Applied for Precision Measurement
• Weak Value Amplification in High Energy Physics: A Case Study for Precision Measurement of CP Violation in B Meson Decays
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