Controlling bright and dark periods of entanglement in dissipative interacting qubits using a radiation field

Quantum logic gates demand a coherent controllable coupling among qubits. One of the main obstacles toward realizing a practical quantum computer is decoherence in the qubits due to their inevitable interaction with the environment. It was shown that entanglement between two non-interacting, but initially entangled, qubits may suffer sudden death, with no revival, due to coupling to pure vacuum noise (Yu and Eberly 2004 Phys. Rev. Lett. 93 140404 ). Furthermore, two interacting qubits coupled to a dissipative or dephasing environment were found to exhibit bright and dark periods of entanglement dynamics. In this work, we show how the exposure of such a dissipative coupled qubits system to a quantum radiation field would significantly affect the durations of these periods and may entirely eliminate them depending on the initial state of the system and its enclosed entanglement as well as the radiation intensity. The thermal effect of the environment on the system dynamics is explored as well.