Entanglement as a quantum order parameter
arXiv:quant-ph/0509049 · doi:10.1088/1367-2630/7/1/254
Abstract
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.
5 pages. No figures. Revised version. References added
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- Influence of the Pauli exclusion principle on scattering properties of cobosons
- Structure of quantum correlations in momentum space and off diagonal long range order in eta pairing and BCS states
- Quantum Ising model in a period-2 modulated transverse field
- Entanglement quantifiers and phase transitions
- Bounding entanglement spreading after a local quench
- A Shielding Property for Thermal Equilibrium States on the Quantum Ising Model