Entanglement as a quantum order parameter

Details Entanglement as a quantum order parameter Entanglement as a quantum order parameter

2005-09-07

arxiv.org/abs/quant-ph/0509049v4

New J. Phys. 7, 254 (2005)

Physics

Quantum Physics

5 pages. No figures. Revised version. References added

Scientific paper

10.1088/1367-2630/7/1/254

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

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