Tunable quantum interference between noisy electron sources

We report shot noise cross correlation measurements in a four terminal beam splitter configuration. By using two tunnel barriers as independent electron sources with tunable statistics and energy, we can adjust the degree of quantum interference that results when the electrons scatter at a beam splitter. Even though quantum interference is only weakly affected by noise, it can be strongly suppressed by detuning the energies of the interfering electrons. Our results illustrate the importance of indistinguishability for quantum interference, and its resilience to unsynchronized electron sources and noise.