Fermionic entanglement in itinerant systems
Paolo Zanardi, Xiaoguang Wang · Journal of Physics A Mathematical and General · 2002
We study pairwise quantum entanglement in systems of fermions itinerant in a lattice from a second-quantized perspective. Entanglement in the grand-canonical ensemble is studied, both for energy eigenstates and for the thermal state. Relations between entanglement and superconducting correlations are discussed in a BCS-like model and for η-pair superconductivity.