Entanglement dynamics of electrons and photons

TL;DR

This paper investigates the mechanisms of entanglement between electrons and photons, emphasizing the roles of spin-spin interactions and spatial separation in the persistence or disappearance of entanglement.

Contribution

It introduces a study on entanglement mechanisms for electron-electron and photon-photon systems based on spin-spin interactions, highlighting the importance of spatial and spin states.

Findings

Entanglement depends on both spatial and spin states.

Entanglement disappears when particles are far apart, despite spin entanglement.

Spatial separation affects the persistence of entanglement.

Abstract

Entanglement is a fundamental feature of quantum theory as well as a key resource for quantum computing and quantum communication, but the entanglement mechanism has not been found at present. We think when the two subsystems exist interaction directly or indirectly, they can be in entanglement state. such as, in the Jaynes-Cummings model, the entanglement between an atom and light field comes from their interaction. In this paper, we have studied the entanglement mechanism of electron-electron and photon-photon, which are from the spin-spin interaction. We found their total entanglement states are relevant both space state and spin state. When two electrons or two photons are far away, their entanglement states should be disappeared even if their spin state is entangled.