Entanglement and quantum order parameters
Abstract
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.
- Publication:
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New Journal of Physics
- Pub Date:
- December 2005
- DOI:
- 10.1088/1367-2630/7/1/254
- arXiv:
- arXiv:quant-ph/0509049
- Bibcode:
- 2005NJPh....7..254B
- Keywords:
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- Quantum Physics
- E-Print:
- 5 pages. No figures. Revised version. References added