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.
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| Official URL http://dx.doi.org/10.1103/PhysRevLett.94.227002 |
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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 |
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| 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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