Long Distance Cavity Entanglement by Entanglement Swapping Using Atomic Momenta

TL;DR

This paper presents a method to entangle distant cavities by using atomic momentum entanglement swapping, involving dispersive atom-cavity interactions and atomic momentum measurements, enabling remote cavity entanglement.

Contribution

It introduces a novel scheme utilizing atomic momentum states and Bell measurements to generate entanglement between distant cavities.

Findings

Successful entanglement of distant cavities demonstrated

Atomic momentum measurement effectively transfers entanglement

Scheme is feasible with current atomic and cavity technology

Abstract

We propose a simple technique to generate entanglement between distant cavities by using entanglement swapping involving atomic momenta. For the proposed scheme, we have two identical atoms, both initially in their ground state, each incident on far apart cavities with particular initial momenta. The two cavities are prepared initially in superposition of zero and one photon state. First, we interact each atom with a cavity in dispersive way. The interaction results into atom-field entangled state. Then we perform EPR state measurement on both atomic momenta state which is an analog of Bell measurement. The EPR state measurement is designed by passing the atoms through cavity beam splitters which transfers the atomic momentum state into superposition state. Finally, these atoms are detected by the detector. After the detection of the atoms, we can distinguish that cavities in one of the Bell states. This process leads to two distant cavity fields entanglement.