Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 76, Issue 2, Pages 113-116Publisher
SPRINGER-VERLAG
DOI: 10.1007/s00340-003-1106-x
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We demonstrate the principle of complementarity in quantum mechanics in a single-photon interference experiment. Single photons are provided by isolated. optically pumped nitrogen-vacancy centers in diamond, which can be easily addressed by confocal microscopy. In order to observe the particle-like behavior of photons, we perform an elementary Welcher-Weg measurement, detecting photons behind a beam splitter. In contrast, if we dispense with this Welcher-Weg information, we observe interference fringes with a visibility of about 96%, revealing the wave nature of the photon.
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