Tunable quantum interference between noisy electron sources

TL;DR

This paper demonstrates tunable quantum interference between noisy electron sources using a four-terminal beam splitter, highlighting the role of electron indistinguishability and energy detuning in quantum interference effects.

Contribution

It introduces a method to control quantum interference between noisy electron sources by tuning their energies, showing interference resilience despite noise.

Findings

Quantum interference can be tuned by energy detuning.

Interference remains resilient despite electron source noise.

Detuning suppresses interference, emphasizing indistinguishability importance.

Abstract

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.