Spin squeezing as a measure of entanglement in a two-qubit system

Messikh, A., Ficek, Z. and Wahiddin, M.R.B. (2003) Spin squeezing as a measure of entanglement in a two-qubit system. Physical Review A, 68 Article No. 064301: . doi:10.1103/PhysRevA.68.064301

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Author Messikh, A.
Ficek, Z.
Wahiddin, M.R.B.
Title Spin squeezing as a measure of entanglement in a two-qubit system
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.68.064301
Open Access Status File (Publisher version)
Volume 68
Issue Article No. 064301
Total pages 4
Editor B. Crasemann
Place of publication United States
Publisher American Physical Society
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract We show that the two definitions of spin squeezing extensively used in the literature [M. Kitagawa and M. Ueda, Phys. Rev. A 47, 5138 (1993) and D.J. Wineland , Phys. Rev. A 50, 67 (1994)] give different predictions of entanglement in the two-atom Dicke system. We analyze differences between the definitions and show that the spin squeezing parameter of Kitagawa and Ueda is a better measure of entanglement than the commonly used spectroscopic spin squeezing parameter. We illustrate this relation by examining different examples of a driven two-atom Dicke system in which spin squeezing and entanglement arise dynamically. We give an explanation of the source of the difference using the negativity criterion for entanglement.
Keyword Physics, Atomic, Molecular & Chemical
Separability Criterion
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 12:05:23 EST