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Journal of Modern Optics

Tripartite entanglement generation using cavity-QED and its dynamics in dissipative environments

Bilal Farooq, Rabia Tahira, Manzoor Ikram

Published Oct 25, 2012• 3 citations
Publisher

Abstract

We investigate the generation of tripartite field states inside the high-Q cavities using the cavity QED. The main goal is to successfully generate the entanglement in tripartite systems by passing two-level atoms through three identical high-Q cavities. Our scheme gives the successful generation of entangled tripartite W and GHZ states for pre-determined interaction times of atoms with the cavity fields. The dynamics of initial entangled states is studied as the system evolves in the dissipative environments.

DOI
10.1080/09500340.2012.735266

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Abstract We develop a theoretical model for entanglement engineering to generate a multipartite system of field states in high-Q cavities using a cavity-QED. Our model consists of two-level atoms interacting successively with the field inside the arbitrary number of high-Q cavities for pre-calculated interaction times of the atoms with the fields. Controlling these pre-calculated interaction times of the atom-field gives the successful generation of the Greenberg–Horne–Zeilinger (GHZ) state and the W-state in N cavities. We also evaluate the dynamics of entanglement of GHZ entangled field states when they interact with the reservoir.
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We propose a potentially practical scheme to generate two-atom maximally entangled states by the large-detuning interaction between two three-level Λ-type atoms and coherent optical fields. Conditioned on the results of detecting cavity field, four pairs of atomic maximally entangled states with unity fidelity and high successful probability can be prepared. We also investigate the influence of the cavity dissipation on the generated entangled states and discuss the experimental feasibility of our scheme.
We investigate a two-level atom coupled to a cavity with a strong classical driving field in a dissipative environment and find an analytical expression for the time evolution density matrix for the system. The analytical density operator is then used to study the entanglement between the atom and cavity by considering the competing process between the atom–field interactions and the field–environment interactions. It is shown that there is an optimal interaction time for generating atom–cavity entanglement.