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As an electrical analog of the optical Hanbury Brown Twiss effect, we studycurrent cross-correlations in a chaotic quantum dot-superconductor junction.One superconducting and two normal reservoirs are connected via point contactsto a chaotic quantum dot. For a wide range of contact widths andtransparencies, we find large positive current correlations. The positivecorrelations are generally enhanced by normal backscattering in the contacts.Moreover, for normal backscattering in the contacts, the positive correlationssurvive when suppressing the proximity effect in the dot with a weak magneticfield.Comment: 4 pages, 3 figure

Chaotic Dot-Superconductor Analog of the Hanbury Brown–Twiss Effect