2010/11/12 by R. Afzali, Afzali, R., A. T. Rezakhani +3
Physics and Astronomy · #Quantum and electron transport phenomena #Physics of Superconductivity and Magnetism #Advanced Chemical Physics Studies
paper · pdf · doi:10.48550/arxiv.1011.3011
We study the effect of a weak magnetic field on the state of the spins of a pair of electrons forming a Cooper pair in an s-wave superconductor. By perturbatively solving time-dependent Bogoliubov equations up to first order, we obtain the two-particle Green function, and whence the two-electron spin-space density matrix. It appears that up to first order approximation, the spin state of a Cooper pair retains the form of a Werner state. This state is then examined in the sense of quantum correlations, i.e., quantum discord.