Entanglement dynamics of a Heisenberg chain with Dzyaloshinskii--Moriya interaction

This paper investigates the entanglement dynamics of the system,composed of two qubits A and B with Heisenberg XX spininteractation. There is a third controller qubit C, which onlyhas Dzyaloshinskii--Moriya (DM) spin-orbit interaction with thequbit B. It is found that depending on the initial state of thecontroller qubit C and DM interaction, the entanglement of thesystem displays amplification and sudden birth effects. Theseeffects indicate that one can control the entanglement of thesystem, which may be helpful for quantum information processing.