Efficient polarization entanglement concentration for electrons with charge detection

TL;DR

This paper introduces a highly efficient entanglement concentration protocol for electrons using charge detection, enabling the conversion of less-entangled pairs into maximally entangled ones without precise state knowledge, beneficial for solid quantum tech.

Contribution

The protocol combines an electronic polarizing beam splitter and charge detector to improve efficiency and practicality over existing linear optics methods for electron entanglement concentration.

Findings

Higher efficiency than linear optics-based protocols

Does not require precise knowledge of initial entanglement state

Applicable to solid quantum computation and communication

Abstract

We present an entanglement concentration protocol for electrons based on their spins and their charges. The combination of an electronic polarizing beam splitter and a charge detector functions as a parity check device for two electrons, with which the parties can reconstruct maximally entangled electron pairs from those in a less-entanglement state nonlocally. This protocol has a higher efficiency than those based on linear optics and it does not require the parties to know accurately the information about the less-entanglement state, which makes it more convenient in a practical application of solid quantum computation and communication.