Ground-state entanglement of the BCS model

Dunning, C. and Links, J. and Zhou, H.Q. (2005) Ground-state entanglement of the BCS model. Physical Review Letters, 94 (22). p. 4. ISSN 0031-9007. (Full text available)

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http://dx.doi.org/10.1103/PhysRevLett.94.227002

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.

Item Type: Article
Uncontrolled keywords: ground states, quantum entanglement, BCS theory
Subjects: Q Science > QA Mathematics (inc Computing science)
Divisions: Faculties > Science Technology and Medical Studies > School of Mathematics Statistics and Actuarial Science > Applied Mathematics
Depositing User: Clare Dunning
Date Deposited: 01 Sep 2008 21:28
Last Modified: 25 Jun 2012 09:37
Resource URI: http://kar.kent.ac.uk/id/eprint/4709 (The current URI for this page, for reference purposes)
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