We study entanglement of electron spins in many-body systems based on the Green's function approach. As an application we obtain the two-particle density matrix of a noninteracting electron gas and identify its two-spin density matrix as a Werner state. We calculate entanglement measures, a classical correlation, mutual information, and a pair-distribution function of two electrons at zero and finite temperatures. We find that changes of entanglement measures are proportional to ${T}^{2}$ at low temperatures.We study entanglement of electron spins in many-body systems based on the Green's function approach. As an application we obtain the two-particle density matrix of a noninteracting electron gas and identify its two-spin density matrix as a Werner state. We calculate entanglement measures, a classical correlation, mutual information, and a pair-distribution function of two electrons at zero and finite temperatures. We find that changes of entanglement measures are proportional to ${T}^{2}$ at low temperatures.

arXiv:quant-ph/0403214Physical Review AMay 21, 200463 citations

QUANTUM DISCORD IN A SPIN SYSTEM WITH SYMMETRY BREAKING

Bruno Tomasello, Davide Rossini, Alioscia Hamma +1 more

WORLD SCIENTIFIC eBooksJun 25, 20130 citations

{T}^{2}

at low temperatures.