Solid-state circuit for spin entanglement generation and purification

TL;DR

This paper presents a solid-state circuit design that uses charge manipulation and measurement techniques to generate and purify four-particle spin entangled states in semiconductor quantum dots, enhancing robustness against noise.

Contribution

It introduces a realistic method combining charge control and exchange interaction for entanglement generation and purification in quantum dots, with noise immunity via decoherence-free subspaces.

Findings

Robust four-particle spin entanglement achieved

Noise immunity through decoherence-free subspace

Effective purification protocol implemented

Abstract

We show how realistic charge manipulation and measurement techniques, combined with the exchange interaction, allow for the robust generation and purification of four-particle spin entangled states in electrically controlled semiconductor quantum dots. The generated states are immunized to the dominant sources of noise via a dynamical decoherence-free subspace; all additional errors are corrected by a purification protocol. This approach may find application in quantum computation, communication, and metrology.