Entangling two atoms via spontaneous emission

Tanas, R. and Ficek, Z. (2004) Entangling two atoms via spontaneous emission. Journal of Optics B-quantum And Semiclassical Optics, 6 3: S90-S97. doi:10.1088/1464-4266/6/3/015

Author Tanas, R.
Ficek, Z.
Title Entangling two atoms via spontaneous emission
Journal name Journal of Optics B-quantum And Semiclassical Optics   Check publisher's open access policy
ISSN 1464-4266
Publication date 2004-03
Sub-type Article (original research)
DOI 10.1088/1464-4266/6/3/015
Volume 6
Issue 3
Start page S90
End page S97
Total pages 7
Editor E. Arimondo
Place of publication Bristol, England
Publisher IOP Publishing
Collection year 2004
Language eng
Subject C1
240402 Quantum Optics and Lasers
780102 Physical sciences
Abstract We discuss the creation of entanglement between two two-level atoms in the dissipative process of spontaneous emission. It is shown that spontaneous emission can lead to a transient entanglement between the atoms even if the atoms were prepared initially in an unentangled state. The amount of entanglement created in the system is quantified by using two different measures: concurrence and negativity. We find analytical formulae for the evolution of concurrence and negativity in the system. We also find the analytical relation between the two measures of entanglement. The system consists of two two-level atoms which are separated by an arbitrary distance r(12) and interact with each other via the dipole-dipole interaction, and the antisymmetric state of the system is included throughout, even for small interatomic separations, in contrast to the small-sample model. It is shown that for sufficiently large values of the dipole-dipole interaction initially the entanglement exhibits oscillatory behaviour with considerable entanglement in the peaks. For longer times the amount of entanglement is directly related to the population of the slowly decaying antisymmetric state.
Keyword Physics, Applied
Quantum Superpositions
Spontaneous Emission
Resonance Fluorescence
Separability Criterion
Entanglement Measures
Nonidentical Atoms
2-atom Systems
Quantum States
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 04:32:29 EST