CeNS Colloquium

Prof. Moty Heiblum
Department of Condensed Matter Physics, Weizmann Institute of Science

I will describe two connected experiments, where pairs of electrons were entangled in a solid state Mach-Zehnder Interferometer (MZI), leading to entirely different outcomes. In one experiment electrons in a "which path" detector were entangled with electrons in a MZI, leading to total dephasing of the interference. Under these conditions, the interference that was lost had been recovered by doing a "post selection" type measurement (via cross-correlating currents), proving that the phase information stayed in the system. In another experiment, making use of two MZIs (in a novel "two particle interferometer"), two remote, indistinguishable electrons were entangled only due to their exchange statistics, namely, without ever interacting with each other (in a similar fashion to the Hanbury Brown-Twiss photonic experiment). Though each electron's paths did not enclose a flux, cross correlating the current fluctuations in the two separate detectors revealed Aharonov-Bohm flux dependent oscillations