Counting statistics of single electron transport through a double quantum dot

Here, we discuss counting statistics of single-electron tunneling in a double quantum dot (DQD). Individual electron tunneling events are recorded with a quantum point contact (PC) acting as a charge sensor (Fujisawa, et. al., 2006). Forward and reverse tunneling events are detected in a real time scale, which allows us to perform statistical analysis on the transport through a DQD. Analyses in frequency and time domains as well as higher-order moments of noise reveal anti-bunching effect and sub-poissonian statistics of single electron transport. Moreover, the device works as a sensitive atto-ampare current meter by counting tunneling events (Fujisawa, et. al., 2006).