Distributed quantum information processing with mobile electrons

TL;DR

This paper proposes a novel method for distributed quantum information processing using mobile electron spins as mediators for entanglement, employing distillation protocols to mitigate environmental errors in solid state systems.

Contribution

It introduces a new entanglement scheme with error reduction techniques using mobile electrons, expanding options beyond photon-based methods for solid state quantum networks.

Findings

High fidelity entanglement achievable despite imperfections

Distillation protocols effectively reduce error accumulation

Feasible approach for solid state quantum networks

Abstract

In distributed quantum information processing, small devices composed of a single or a few qubits are networked together through shared entanglement to achieve a scalable machine. Typically, photons are utilized to generate remote entanglement between optically active matter qubits. In this paper, we consider another possibility for achieving entanglement between nodes: using mobile electron spins as mediators of the interaction between static qubits at each node. A strong interaction between electrons makes it feasible to couple the flying electron with the static electron. However, since the electrons easily interact with the environment, error accumulation during the entanglement operation could be more severe than with the other strategy using photons as flying qubits. We introduce a new scheme especially designed to minimize such error accumulation by using several distillation protocols. The conclusion is that a high fidelity entanglement operation can be constructed even under the effect of typical imperfections, and this suggestion therefore offers a feasible route for the realization of distributed quantum information processing in solid state systems.