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Journal of Physics B Atomic Molecular and Optical Physics

On conditions for atomic entanglement sudden death in cavity QED

Zhong‐Xiao Man, Yun‐Jie Xia, Nguyen Ba An

Published Apr 4, 2008• 38 citations
Publisher

Abstract

In this paper, we study the entanglement dynamics of atoms coupled to cavity fields. We consider conditions characterized not only by the purity of the atomic initial state but also by the cavity photon number. By studying three different models within the framework of cavity QED, we show that the so-called atomic entanglement sudden death always occurs if initially the atomic state is sufficiently impure and/or the cavity photon number is nonzero.

DOI
10.1088/0953-4075/41/8/085503

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In this paper, we study the entanglement dynamics of atoms coupled to cavity fields. We consider conditions characterized not only by the purity of the atomic initial state but also by the cavity photon number. By studying three different models within the framework of cavity QED, we show that the so-called atomic entanglement sudden death always occurs if initially the atomic state is sufficiently impure and/or the cavity photon number is nonzero.
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The entanglement dynamics involving the so-called entanglement sudden death of atoms in two-photon Tavis-Cummings model is investigated.Various initial conditions that may have influences on the entanglement evolution of atoms, especially on the appearance of atomic entanglement sudden death, are studied.The appearance of entanglement sudden death is sensitive to the initial conditions of the whole system, i.e., the concrete type of atomic initial state, the photon number in the cavity field, and the dipole-dipole interaction between atoms.It is shown that the strong dipole-dipole interaction between atoms can weaken the atomic entanglement sudden death.