Multiterminal Counting Statistics
The field of quantum noise in mesoscopic systems has been exploded during the last decade, some achievements being summarized in a recent review article.  While in classical systems shot noise is just a straightforward manifestation of discreteness of the electron charge, it can be used in quantum system as unique tool to reveal the information about the electron correlations and entanglement of various kinds. Measurement of fractional charge in Quantum Hall regime , noise measurements in atomic-size junctions , chaotic quantum dots and superconductors [6, 6] are milestones of the field of quantum noise. Starting from the pioneering work of Büttiker, a special attention has been also paid to shot noise and noise correlations in the ”multi-terminal” circuits. The correlations of currents flowing to/from different terminals can, for instance, reveal Fermi statistics of electrons. Such cross-correlations have been recently seen experimentally in Ref. [8, 9, 10].
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