Quantum repeater without Bell measurment in double quantum dot system

TL;DR

This paper introduces a novel quantum repeater scheme using double quantum dots that eliminates the need for Bell measurements, enhancing experimental feasibility and success probability in solid-state quantum communication.

Contribution

It presents a Bell measurement free protocol for quantum repeaters in double quantum dot systems, differing from DLCZ by simplifying entanglement swapping.

Findings

Eliminates Bell measurements in quantum repeater protocol

Increases success probability of solid-state quantum repeaters

Uses entanglement units composed of four pairs of quantum dots

Abstract

We propose a Bell measurement free scheme to implement a quantum repeater in GaAs/AlGa double qunatum dot systems.we prove the four pairs of double quantum dots compose an entanglement unit, given the the initial state is singlet states. Our shceme differs from the famous Duan-Lukin-Cirac-zoller(DLCZ) protocol in that Bell measurements are unneccessary for the entanglement swapping,which provides great advantages and conveniences in experimental implementaion. Our scheme significantly improve the success probability of quantum repeaters based on solid state quantum devices.