Extremal Density Matrices for Qudit States

  title={Extremal Density Matrices for Qudit States},
  author={Armando Figueroa and Julio A. L{\'o}pez-Sald́ıvar and Octavio Casta{\~n}os and Ram{\'o}n L{\'o}pez – Pe{\~n}a},
An algebraic procedure to find extremal density matrices for any Hamiltonian of a qudit system is established. The extremal density matrices for pure states provide a complete description of the system, that is, the energy spectra of the Hamiltonian and their corresponding projectors. For extremal density matrices representing mixed states, one gets mean values of the energy in between the maximum and minimum energies associated to the pure case. These extremal densities give also the… CONTINUE READING