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Entanglement at the quantum phase transition in a harmonic lattice

Abstract:

The entanglement properties of phase transition in a twodimensional harmonic lattice, similar to the one observed in recent ion trap experiments, are discussed for both finite number of particles and thermodynamical limit. We show that for the ground state at the critical value of the trapping potential, two entanglement measures, the negativity between two neighbouring sites and the block entropy for blocks of size 1, 2 and 3, change abruptly. Entanglement thus indicates quantum phase transi...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.1088/1367-2630/12/2/025017

Authors


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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, REF-Physics
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Funding agency for:
Vedral, V
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Funding agency for:
Vedral, V
Publisher:
IOP Publishing Publisher's website
Journal:
New Journal of Physics Journal website
Volume:
12
Issue:
2
Pages:
Article: 025017
Publication date:
2010-02-05
DOI:
EISSN:
1367-2630
ISSN:
1367-2630
URN:
uuid:6b47c585-9207-4329-be4a-97d220d9ef66
Source identifiers:
158766
Local pid:
pubs:158766
Language:
English

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