dorsal/arxiv
View SchemaQuantifying ground state entanglement of the BCS model
| Authors | Clare Dunning, Jon Links, Huan-Qiang Zhou |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0411032 |
| URL | https://arxiv.org/abs/quant-ph/0411032 |
| DOI | 10.1103/PhysRevLett.94.227002 |
| Journal | Phys.Rev.Lett. 94 (2005) 227002 |
Abstract
The concept of local concurrence is used to quantify the entanglement between a single qubit and the remainder of a multi-qubit system. For the ground state of the BCS model in the thermodynamic limit the set of local concurrences completely describe 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 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.
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"abstract": "The concept of local concurrence is used to quantify the entanglement between\na single qubit and the remainder of a multi-qubit system. For the ground state\nof the BCS model in the thermodynamic limit the set of local concurrences\ncompletely describe the entanglement. As a measure for the entanglement of the\nfull system we investigate the Average Local Concurrence (ALC). We find that\nthe ALC satisfies a simple relation with the order parameter. We then show that\nfor finite systems with fixed particle number, a relation between the ALC and\nthe condensation energy exposes a threshold coupling. Below the threshold,\nentanglement measures besides the ALC are significant.",
"arxiv_id": "quant-ph/0411032",
"authors": [
"Clare Dunning",
"Jon Links",
"Huan-Qiang Zhou"
],
"categories": [
"quant-ph",
"cond-mat.str-el",
"hep-th"
],
"doi": "10.1103/PhysRevLett.94.227002",
"journal_ref": "Phys.Rev.Lett. 94 (2005) 227002",
"title": "Quantifying ground state entanglement of the BCS model",
"url": "https://arxiv.org/abs/quant-ph/0411032"
},
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