Efficient scheme for atomic entangled states with cavity QED system

TL;DR

This paper presents a deterministic, measurement-free protocol for generating atomic entangled states in cavity QED systems, robust against cavity decay and spontaneous emission, with potential quantum information applications.

Contribution

It introduces a novel, efficient scheme using Raman transitions or stimulated Raman adiabatic passages to produce entangled atomic states without requiring cavity field measurements or atomic detection.

Findings

Protocol is insensitive to cavity decay.

Entangled states can be generated deterministically.

Suitable for quantum information processing applications.

Abstract

A protocol is proposed to generate atomic entangled states in a cavity QED system. It utilizes Raman transitions or stimulated Raman adiabatic passages between two systems to entangle the ground states of two three-state $\Lambda$-type atoms trapped in a single mode cavity. It does not need the measurements on cavity field nor atomic detection and can be implemented in a deterministic fashion. Since the present protocol is insensitive to both cavity decay and atomic spontaneous emission, the produced entangled states may have some interesting applications in quantum information processing.