Which-way information in a nested Mach-Zehnder interferometer

Václav Potoček, Gergely Ferenczi

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Recently, A. Danan et al. [Phys. Rev. Lett. 111, 240402 (2013)] performed a much-discussed experiment in which which-way information was obtained from the light in a nested Mach-Zehnder interferometer by weak measurement. The presented analysis using the two-state vector formalism drew the conclusions that the photons followed disconnected paths. We analyze this experiment using standard quantum optical methods and arrive at analytical expressions that match the experimental results without the need for such disconnected photon paths. We also propose a simple amendment to the experiment capable of displaying new phenomena, highlighting the advantages of our description.
Original languageEnglish
Article number023829
Number of pages6
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number2
Publication statusPublished - 17 Aug 2015


  • physics
  • mach-zehnder interferometer
  • light


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