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Ground-state entanglement of the BCS model

Dunning, Clare, Links, Jon, Zhou, Huan-Qiang (2005) Ground-state entanglement of the BCS model. Physical Review Letters: Moving Physics Forward, 94 (22). p. 4. ISSN 0031-9007. (doi:10.1103/PhysRevLett.94.227002) (KAR id:4709)

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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
DOI/Identification number: 10.1103/PhysRevLett.94.227002
Uncontrolled keywords: ground states, quantum entanglement, BCS theory
Subjects: Q Science > QA Mathematics (inc Computing science)
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Mathematics, Statistics and Actuarial Science
Depositing User: Clare Dunning
Date Deposited: 01 Sep 2008 21:28 UTC
Last Modified: 16 Feb 2021 12:16 UTC
Resource URI: (The current URI for this page, for reference purposes)
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