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We propose a Hanbury Brown and Twiss (HBT) experiment of Cooper pairs on theedge channels of quantum spin Hall insulators. The helical edge channelsprovide a well defined beam of Cooper pairs and perfect Andreev reflectionsfrom superconductors. Surprisingly, the Cooper pairs do not bear a bosonicnature at all once emitted from the superconductor, and the cross correlationis strongly negative as for free electrons. This result is counter-intuitive,and seemingly contradictory to the previous theoretical and recent experimentalresults. We will point out that our setup is much closer in spirit to theoriginal HBT experiment (and different) than those in previous works. We willargue that these differences affect significantly the results.

Hanbury Brown and Twiss Correlations of Cooper Pairs in Helical Liquids