Entanglement generation and transfer between remote atomic qubits interacting with squeezed field

TL;DR

This paper investigates how entanglement can be generated and transferred between remote atomic qubits interacting with a squeezed field, analyzing entanglement dynamics, sudden death, and revival using numerical methods.

Contribution

It introduces a detailed numerical analysis of three-qubit entanglement dynamics involving remote atoms and a squeezed field, highlighting the roles of initial entanglement and squeezing degree.

Findings

Initial entanglement of the field and atoms enhances three-qubit entanglement.

Optimal entanglement occurs with a squeeze parameter s=0.64.

Lower squeezing (s=0.4) can produce comparable entanglement without sudden death.

Abstract

A pair of two level atoms A1A2, prepared either in a separable state or in an entangled state, interacts with a single mode of two mode squeezed cavity field while a third atomic qubit B interacts with the second mode of the squeezed field in a remote cavity. We analyze, numerically, the generation, sudden death and revival of three qubit entanglement as a function of initial entanglement of qubits A1A2 and degree of squeezing of electromagnetic field. Global negativity of partially transposed state operator is used to quantify the entanglement of three atom state. It is found that the initial entanglement of two mode field as well as that of the pair A1A2, both, contribute to three atom entanglement. A maximally entangled single excitation Bell pair in first cavity and two mode field with squeeze parameter s=0.64 are the initial conditions that optimize the peak value of three qubit mixed state entanglement. A smaller value of s=0.4 under similar conditions is found to generate a three qubit mixed state with comparable entanglement dynamics free from entanglement sudden death.