中文摘要：

基于量子主方程研究了耦合双量子点的全计数统计．数值结果表明平均电流的台阶依赖于系统输运通道能级结构，两个量子点之间的耦合以及量子点与电极的耦合决定了输运特性和噪声特性．当两个量子点之间的耦合一定时，量子点与左右电极的耦合强度之比小于某个临界值时，会出现负微分电导和超泊松散粒噪声，这个临界值依赖于两个量子点之间的耦合强度．

英文摘要：

The full counting statistics of transport through coupled double quantum dots was studied based on quantum master equation. The numerical results show that the current steps depend on the level structure of the transport channels. The coupling between two quantum dots and between quantum dots with the electrodes determine the transport characteristics and shot noises. For a given coupling between two quantum dots,the negative differential conductance and super-Poissonian shot noises occur when the ratio of the intensities between the left-electrode and right-electrode coupling with quantum dots is less than the certain critical value which depends on the coupling between two quantum dots.