Time-resolved interference experiments in a solid state environment

We investigate interference of electrons in an Aharonov–Bohm geometry with two embedded quantum dots. The interfering electrons are detected using time-resolved charge detection methods. The Aharonov–Bohm oscillations have a visibility higher than 90%, demonstrating a high degree of phase coherence in the system. We use the technique to probe phase shifts for excited states in one of the embedded quantum dot.