Bell-state preparation for electron spins in a semiconductor double quantum dot

TL;DR

This paper proposes a robust method for preparing and trapping Bell states of electron spins in a semiconductor double quantum dot, effectively minimizing decoherence effects through optimized control fields.

Contribution

It introduces a scheme for stable spin entanglement and state trapping in a solid-state system, addressing decoherence challenges with control techniques.

Findings

Successful state trapping in a Bell state despite decoherence

Minimized decoherence effects using optimized control fields

Demonstrated stable spin entanglement in a semiconductor quantum dot system

Abstract

A robust scheme for state preparation and state trapping for the spins of two electrons in a semiconductor double quantum dot is presented. The system is modeled by two spins coupled to two independent bosonic reservoirs. Decoherence effects due to this environment are minimized by application of optimized control fields which make the target state to the ground state of the isolated driven spin system. We show that stable spin entanglement with respect to pure dephasing is possible. Specifically, we demonstrate state trapping in a maximally entangled state (Bell state) in the presence of decoherence.