Coherent electronic transfer in quantum dot systems using adiabatic passage

TL;DR

This paper presents a scheme for rapid, all-electrical, adiabatic electron transfer in quantum dot systems that maintains coherence and can be extended to multi-dot arrangements for quantum information transport.

Contribution

It introduces a novel adiabatic transfer method that avoids electron occupation of the middle dot and analyzes its extension to multi-dot systems for quantum information transport.

Findings

Efficient, coherent electron transfer without occupying the middle dot.

Applicable to quantum-dot cellular automata and quantum computing.

Extended analysis for multi-dot quantum information transport.

Abstract

We describe a scheme for using an all-electrical, rapid, adiabatic population transfer between two spatially separated dots in a triple-quantum dot system. The electron spends no time in the middle dot and does not change its energy during the transfer process. Although a coherent population transfer method, this scheme may well prove useful in incoherent electronic computation (for example quantum-dot cellular automata) where it may provide a coherent advantage to an otherwise incoherent device. It can also be thought of as a limiting case of type II quantum computing, where sufficient coherence exists for a single gate operation, but not for the preservation of superpositions after the operation. We extend our analysis to the case of many intervening dots and address the issue of transporting quantum information through a multi-dot system.