Time evolution of the entanglement between a four-level atom near the band edge of a photonic crystal and its spontaneous emission field is investigated. It is shown that the quantum entropy has a faster oscillator behavior as the upper levels move further into the band gap. Entanglement oscillations can be controlled by the intensity and the detuning of the coupling field. An enhanced entanglement is achieved in the presence of quantum interference resulting from the two possible decay channels. In addition, the atom–photon entanglement will be influenced noticeably by the reservoir coupling constant, intensity of coupling field, and the detuning.
Quantum Information Processing – Springer Journals
Published: Apr 18, 2017
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