Locality and Nonlocality in the Interaction-Free Measurement

Authors

Daniel Rohrlich, Ben-Gurion University of the Negev
Yakir Aharonov, Chapman UniversityFollow
Tomer Landsberger, Tel Aviv University

Document Type

Article

Publication Date

8-3-2018

Abstract

We present a paradox involving a particle and a mirror. They exchange a nonlocal quantity, modular angular momentum L_z mod 2ћ, but there seems to be no local interaction between them that allows such an exchange. We demonstrate that the particle and mirror do interact locally via a weak local current 〈L_z mod 2ћ〉_w. In this sense, we transform the “interaction-free measurement” of Elitzur and Vaidman, in which two local quantities (the positions of a photon and a bomb in the two arms of a Mach-Zehnder interferometer) interact nonlocally, into a thought experiment in which two nonlocal quantities (the weak modular angular momentum of the particle and of the mirror) interact locally.

Comments

This article was originally published in EPJ Web of Conferences, volume 182, in 2018. DOI: 10.1051/epjconf/201818202105

Recommended Citation

D. Rohrlich, Y. Aharonov, and T. Landsberger, EPJ Web of Conferences 182, 02105 (2018).
doi: 10.1051/epjconf/201818202105

Peer Reviewed

1

Copyright

The authors

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.