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Journal of Physics B Atomic Molecular and Optical Physics

Quadripartite entanglement with injected atomic coherence

Xi-Dong Wang, Fei Wang, Xiao Guang Zhu

Published Nov 24, 2015• 1 citation
Publisher

Abstract

Abstract We propose a scheme to generate quadripartite Greenberger-Horne-Zeilinger entanglement by coherently preparing the five-level K -type atoms in a superposition initially. The conditions of initial atomic populations and atomic coherences to obtain the output genuine quadripartite entanglement are analyzed numerically in detail. It is found that good entanglement occurs when populations of the bottom levels are much more than the upper levels, or vice versa. In addition, the dependence of quantum entanglement on linear gain coefficient, cavity damping constant, and thermal fluctuation effect are also discussed. Our numerical results confirm that the quadripartite entanglement can be realized by choosing proper values of the initial atomic population, which provide convenience for experimental implementation.

DOI
10.1088/0953-4075/49/1/015501

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Abstract We propose a scheme to generate quadripartite Greenberger-Horne-Zeilinger entanglement by coherently preparing the five-level K -type atoms in a superposition initially. The conditions of initial atomic populations and atomic coherences to obtain the output genuine quadripartite entanglement are analyzed numerically in detail. It is found that good entanglement occurs when populations of the bottom levels are much more than the upper levels, or vice versa. In addition, the dependence of quantum entanglement on linear gain coefficient, cavity damping constant, and thermal fluctuation effect are also discussed. Our numerical results confirm that the quadripartite entanglement can be realized by choosing proper values of the initial atomic population, which provide convenience for experimental implementation.
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In this paper, the output quantum correlations of three fields interacting with inverted Y-type atoms inside a three-mode cavity are investigated. By numerically calculating the stationary noise spectra of the fields, we show that it is possible to generate the genuine tripartite continuous variable entanglement outside the cavity by coherently preparing the atoms in a superposition of the upper excited state and two ground states initially. Our numerical results demonstrate that both zero frequency entanglement and sideband frequency entanglement can be obtained under different initial coherent conditions. In addition, we investigate the thermal fluctuation effects on the quantum entanglement. It is found out that the entanglement occurring in a high frequency regime is more robust against thermal noise than the zero frequency entanglement, which may be useful for quantum communication.
We study entanglement dynamics for a six-qubit model in cavity QED, where three two-level atoms A , B and C are initially prepared in a Greenberger–Horne–Zeilinger (GHZ)-like state and locally coupled with the independent cavities a , b and c , respectively. We consider entanglement evolution via negativity for the tripartite subsystems of atoms and the corresponding cavities. By choosing two types of GHZ-like states as atomic initial states, we shall show that the entanglement of atoms may or may not exhibit entanglement sudden death (ESD) depending on the type of atomic initial state.
We propose a way for generating nnn-qubit Greenberger-Horne-Zeilinger (GHZ) entangled states with a three-level qubit system and $(n\ensuremath{-}1)$ four-level qubit systems in a cavity. This proposal does not require identical qubit-cavity coupling constants and thus is tolerant to qubit-system parameter nonuniformity and nonexact placement of qubits in a cavity. The proposal does not require adjustment of the qubit-system level spacings during the entire operation. Moreover, it is shown that entanglement can be deterministically generated using this method and the operation time is independent of the number of qubits. The present proposal is quite general, which can be applied to physical systems such as various types of superconducting devices coupled to a resonator or atoms trapped in a cavity.
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