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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Entanglement and quantum order parameters

Fernando G S L Brandão

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We show that the quantum order parameters (QOPs) associated with the transitions between a normal conductor and a superconductor in the BCS and η-pairing models and between a Mott-insulator and a superfluid in theBose–Hubbard model are directly related to the amount of entanglement existent in the ground state of each system. This connection gives a physical meaningful interpretation to these QOP, which shows the intrinsically quantum nature of the phase transitions considered.


PACS

03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

03.67.Mn Entanglement measures, witnesses, and other characterizations

74.20.Fg BCS theory and its development

Subjects

Superconductivity

Computational physics

Quantum information and quantum mechanics

Dates

Issue 1 (December 2005)

Received 13 October 2005

Published 16 December 2005



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