Abstract

When a photon beam from a light source is split in two, with one part transmitted and the other reflected at a half-silvered mirror, it is found that the intensities of these beams are correlated: the photons exhibit bunching, that is, they tend to come in clusters of identical particles occupying the same state. In contrast, electrons are expected to exhibit and therefore a negative intensity correlation. BA¼ttiker (page [275][1]) discusses two successful measurements of such antibunching of fermions in mesoscopic conductors (Henny et al. , page [296][2], and Oliver et al. , page [299][3]) and explains why their approach is important for investigating a range of subjects from superconductivity to noise suppression in quantum computing. [1]: http://www.sciencemag.org/cgi/content/short/284/5412/275 [2]: http://www.sciencemag.org/cgi/content/short/284/5412/296 [3]: http://www.sciencemag.org/cgi/content/short/284/5412/299

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