Illustration of quantum complementarity using single photons interfering on a grating

Details Illustration of quantum complementarity using single photons interfering on a grating Illustration of quantum complementarity using single photons interfering on a grating

2008-07-31

arxiv.org/abs/0807.5079v2

New J. Phys. 10, 123009 (2008)

Physics

Quantum Physics

11 pages, 5 figures

Scientific paper

10.1088/1367-2630/10/12/123009

A recent experiment performed by S. S. Afshar et al. has been interpreted as a violation of Bohr's complementarity principle between interference visibility and which-path information in a two-path interferometer. We have reproduced this experiment, using true single-photon pulses propagating in a two-path wavefront- splitting interferometer realized with a Fresnel's biprism, and followed by a grating with adjustable transmitting slits. The measured values of interference visibility V and which-path information, characterized by the distinguishability parameter D, are found to obey the complementarity relation V^2+D^2=<1. This result demonstrates that the experiment can be perfectly explained by the Copenhagen interpretation of quantum mechanics.

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