Two-mode excited entangled coherent states and their entanglement properties

TL;DR

This paper introduces two types of two-mode excited entangled coherent states, analyzes their entanglement properties, and shows how photon excitations influence entanglement, with potential generation methods in cavity QED.

Contribution

The paper presents a new class of two-mode excited entangled coherent states and studies their entanglement, highlighting the effects of photon excitations and methods for their generation.

Findings

$| ext{ extPsi}_-( ext{ extalpha},m,n)>$ is always maximally entangled.

Photon excitations significantly affect entanglement in $| ext{ extPsi}_+( ext{ extalpha},m,n)>$.

Entanglement in TMEECSs exceeds that of single-mode excited states with same photon number.

Abstract

We introduce two types of two-mode excited entangled coherent states (TMEECSs) $|\Psi_{\pm}(\alpha,m,n)>$, study their entanglement characteristics, and investigate the influence of photon excitations on quantum entanglement. It is shown that for the state $|\Psi_{+}(\alpha,m,n)>$ the two-mode photon excitations affect seriously entanglement character while the the state $|\Psi_{-}(\alpha,m,n)>$ is always a maximally entangled state. We show how such states can be produced by using cavity QED and quantum measurements. It is found that the entanglement amount of the TMEECSs is larger than that of the single-mode excited entangled coherent states with the same photon excitation number.