Entanglement of an exciton in a quantum dot molecule in radiation pulses

We theoretically analyze the dynamical behaviors of an interacting electron–hole pair in a double coupled quantum dot molecule in radiation pulses. It is found the maximally entangled Bell states can be prepared when a resonant transfer occurs between two localized states. The strength and duration of selective light pulses for producing maximally entangled states are identified by analytic and exact numerical solution of the quantum dynamical equations under the stronger Coulomb interaction.