Illustration of quantum complementarity using single photons interfering on a grating
نویسنده
چکیده
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 wavefrontsplitting 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 ≤ 1. This result demonstrates that the experiment can be perfectly explained by the Copenhagen interpretation of quantum mechanics. PACS numbers: 03.65.Ta, 42.50.Ar, 42.50.Xa Submitted to: New J. Phys. ar X iv :0 80 7. 50 79 v2 [ qu an tph ] 1 0 Fe b 20 09 Illustration of quantum complementarity using single photons interfering on a grating2
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