Generation of EPR pairs and interconversion of static and flying electron spin qubits

TL;DR

This paper presents a method to generate and interconvert entangled static and flying electron spin qubits using surface acoustic waves and quantum dots in semiconductor structures, enabling dynamic control of entanglement.

Contribution

It introduces a novel mechanism for creating and converting entangled electron pairs between static and moving quantum dots in semiconductor devices.

Findings

Demonstrates a feasible method for generating entangled electron pairs.

Shows how to load electrons into static and moving quantum dots.

Enables arbitrary interconversion of static and flying spin qubits.

Abstract

We propose a method of generating fully entangled electron spin pairs using an open static quantum dot and a moving quantum dot, realized by the propagation of a surface acoustic wave (SAW) along a quasi-one-dimensional channel in a semiconductor heterostructure. In particular, we consider a static dot (SD) loaded with two interacting electrons in a singlet state and demonstrate a mechanism which enables the moving SAW-dot to capture and carry along one of the electrons, hence yielding a fully entangled static-flying pair. We also show how with the same mechanism we can load the SD with one or two electrons which are initially carried by a SAW-induced dot. The feasibility of realizing these ideas with existing semiconductor technology is demonstrated and extended to yield flying or static pairs that are fully entangled and arbitrary interconversion of static and flying electron spin qubits.