Comment on "one-state vector formalism for the evolution of a quantum state through nested Mach-Zehnder interferometers"

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Abstract

Bartkiewicz et al. [2aaPhys. Rev. A 91, 012103 (2015)PLRAAN1050-294710.1103/PhysRevA.91.012103] provided an alternative analysis of an experiment performed by Danan et al. [1abPhys. Rev. Lett. 111, 240402 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.240402] which presented surprising evidence regarding the past of photons passing through an interferometer. They argued that the quantity used by Danan et al. is not a suitable which-path witness, and proposed an alternative. The weaknesses of the analysis are discussed, and it is argued that the alternative, analyzed properly, provides no new predictions.

Original languageEnglish
Article number036103
JournalPhysical Review A
Volume93
Issue number3
DOIs
StatePublished - 31 Mar 2016

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