Spontaneously created entanglement between two atoms

Ficek, Z. (2010) Spontaneously created entanglement between two atoms. Optics and Spectroscopy, 108 3: 347-355. doi:10.1134/S0030400X10030069


Author Ficek, Z.
Title Spontaneously created entanglement between two atoms
Journal name Optics and Spectroscopy   Check publisher's open access policy
ISSN 0030-400X
0030-4034
1562-6911
Publication date 2010-03
Sub-type Article (original research)
DOI 10.1134/S0030400X10030069
Volume 108
Issue 3
Start page 347
End page 355
Total pages 9
Place of publication Moscow, Russian Federation
Publisher M A I K Nauka - Interperiodica
Collection year 2011
Language eng
Abstract Spontaneous emission as a potential tool for creation of entanglement between two atoms is investtigated. We assume that the atoms are coupled to the same environment and study entanglement engineering between the atoms and its transfer between different states. The role of the atomic coherence induced by spontaneous emission will be explored which, in contrast to what is generally believed, can create entanglement between initially unentangled atoms. We quantify entanglement by the concurrence and find that it exhibits threshold properties that can lead to interesting noncontinuous phenomena of sudden birth and sudden death of entanglement. In addition, we consider the mechanism involved in creation of entanglement between distant atoms coupled to a single-mode cavity field. We include a possible variation of the coupling constants between the atoms and the cavity mode with location of the atoms in a standing-wave cavity mode. Effectively, we engineer two coupled atoms whose the dynamics are analogous to that of interacting and collectively damped two nonidentical atoms. We illustrate the interesting result that spatial variations of the coupling constants can lead to a stationary entanglement between the atoms. We explain this effect in terms of the trapping phenomenon of atomic population in a non-decaying entangled state.Copyright © 2010 Pleiades Publishing, Ltd.
Keyword Spontaneous emission
2-atom Systems
Disentanglement
States
Qubits
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Physical Sciences Publications
 
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Created: Sun, 25 Apr 2010, 00:01:41 EST