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Optics Communications

Dynamic generation and coherent control of beating stationary light pulses by a microwave coupling field in five-level cold atoms

Qian-Qian Bao, Yan Zhang, Cui-Li Cui, Shao-Ying Meng, You-Wei Fang, Xue-Dong Tian

Published Dec 9, 2017• 1 citation
Publisher
DOI
10.1016/j.optcom.2017.11.081

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We study a five-level double-tripod system of cold atoms for efficiently manipulating the dynamic propagation and evolution of a quantum probe field by modulating four classical control fields. Our numerical results show that it is viable to transform the quantum probe field into a pair of two-color stationary light pulses mutually coupled through two wave packets of atomic spin coherence. The pair of stationary light pulses can be released either from the sample entrance and exit synchronously or just from the sample exit with a controlled time delay. In addition, the two-color stationary light pulses are immune to the fast decay originating from the higher-order Fourier components of atomic spin and optical coherence, and may exhibit the quantum limited beating signals with their characteristic frequency determined by detunings of the four classical control fields. These results could be explored to design novel photonic devices, such as optical routing, beam splitter, and beat generator, for manipulating a quantum light field.
We propose an efficient scheme for the dynamic generation and manipulation of beating signals in a sample of cold atoms driven into the four-level quasi-Λ configuration. This scheme relies on a procedure of light storage and retrieval controlled by a classical coupling field with a microwave field introduced only in the retrieval stage. One quantum probe field, incident upon this atomic sample, is transformed into a collective excitation of atomic spin coherence and then into two optical components characterized by different time-dependent phases. Consequently the retrieved quantum probe field exhibits a series of maxima and minima (beating signals) in intensity due to the alternative constructive and destructive interference. This interesting phenomenon, in fact, involves the coherent conversion between single-mode and two-mode dark-state polaritons and could be explored to measure the microwave intensity with high-precision beating signals.
We have studied stationary and quasistationary signal light pulses in cold \ensuremath{\Lambda}-type atomic media driven by counterpropagating control laser fields at the condition of electromagnetically induced transparency. By deriving a dispersion relation we present spectral and temporal properties of the signal light pulse and a significant influence of atomic decoherence on the coupled stationary light pulses for spatial splitting. Finally we discuss quasistationary light pulse evolution characterized by frozen spatial spreading for a robust coherent control of slow light pulses.