Counting statistics of coherent population trapping in quantum dots

TL;DR

This paper analyzes how quantum interference in triple quantum dots affects charge transfer statistics, revealing a transition from sub-Poissonian to super-Poissonian behavior as decoherence increases.

Contribution

It provides a theoretical calculation of charge counting statistics in coherent population trapping, highlighting the impact of decoherence on electron transfer fluctuations.

Findings

Transition from sub-Poissonian to super-Poissonian statistics with increasing decoherence

Quantitative analysis of charge transfer fluctuations in quantum dot systems

Identification of conditions affecting electron transfer noise characteristics

Abstract

Destructive interference of single-electron tunneling between three quantum dots can trap an electron in a coherent superposition of charge on two of the dots. Coupling to external charges causes decoherence of this superposition, and in the presence of a large bias voltage each decoherence event transfers a certain number of electrons through the device. We calculate the counting statistics of the transferred charges, finding a crossover from sub-Poissonian to super-Poissonian statistics with increasing ratio of tunnel and decoherence rates.