Ground-State Entanglement of the BCS Model

Dunning, Clare, Links, Jon and Zhou, Huan-Qiang (2005) Ground-State Entanglement of the BCS Model. Physical Review Letters, 94 22: 227002-1-227002-4. doi:10.1103/PhysRevLett.94.227002

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Author Dunning, Clare
Links, Jon
Zhou, Huan-Qiang
Title Ground-State Entanglement of the BCS Model
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.94.227002
Open Access Status File (Publisher version)
Volume 94
Issue 22
Start page 227002-1
End page 227002-4
Total pages 4
Editor Sandweiss, J.
Place of publication Ridge, USA
Publisher American Physical Society
Collection year 2005
Language eng
Subject C1
230199 Mathematics not elsewhere classified
780101 Mathematical sciences
010506 Statistical Mechanics, Physical Combinatorics and Mathematical Aspects of Condensed Matter
010502 Integrable Systems (Classical and Quantum)
Abstract The concept of local concurrence is used to quantify the entanglement between a single qubit and the remainder of a multiqubit system. For the ground state of the BCS model in the thermodynamic limit the set of local concurrences completely describes the entanglement. As a measure for the entanglement of the full system we investigate the average local concurrence (ALC). We find that the ALC satisfies a simple relation with the order parameter. We then show that for finite systems with a fixed particle number, a relation between the ALC and the condensation energy exposes a threshold coupling. Below the threshold, entanglement measures besides the ALC are significant.
Keyword Physics, Multidisciplinary
Q-Index Code C1

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Created: Mon, 13 Aug 2007, 15:16:27 EST