Quantum brachistochrone problem for two spins-1/2 with anisotropic Heisenberg interaction

A. R. Kuzmak, V. M. Tkachuk

We study the quantum brachistochrone evolution for a system of two spins-$\frac{1}{2}$ described by an anisotropic Heisenberg Hamiltonian without $zx$, $zy$ interacting couplings i…