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)

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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 10.1103/PhysRevLett.94.227002 ground states, quantum entanglement, BCS theory Q Science > QA Mathematics (inc Computing science) Faculties > Sciences > School of Mathematics Statistics and Actuarial Science > Applied Mathematics Clare Dunning 01 Sep 2008 21:28 UTC 28 May 2019 13:40 UTC https://kar.kent.ac.uk/id/eprint/4709 (The current URI for this page, for reference purposes)