Abstract

We introduce here double electromagnetically induced grating (DEIG) using a tripod atomic structure, wherein two probe and signal fields with different frequencies simultaneously experience an atomic grating. Properties of presented DEIG can be substantially modified by the detuning of the applied fields. It has also been found that applying an incoherent pump field has a remarkable influence on the high-order diffraction efficiencies. Amplification of travelling weak lights via the incoherent pump field results in large diffraction efficiencies in the first-order and second-order directions. Such a novel scheme might open up the possibility for designing a two-qubit switch that would be advantageous to quantum information processing and quantum networking.

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