Correlated Counting of Single Electrons in a Nanowire Double Quantum Dot
  We report on correlated real-time detection of individual electrons in an InAs nanowire double quantum dot. Two self-aligned quantum point contacts in an underlying two-dimensional electron gas material serve as highly sensitive charge detectors for the double quantum dot. Tunnel processes of individual electrons and all tunnel rates are determined by simultaneous measurements of the correlated signals of the quantum point contacts. 
Theodore Choi, Ivan Shorubalko, Simon Gustavsson, Silke Sch\"on, Klaus   Ensslin