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IEEE Photonics Technology Letters

Two-Channel Router of Phase Control Optical Nonreciprocity in Parametric Amplified Four-Wave Mixing

Kangkang Li, Haijun Tang, Irfan Ahmed, Bingling Gu, Kun Wang, Gaoguo Yang, Renan Bu, Yanpeng Zhang

Published Feb 12, 2018• 2 citations
Publisher

Abstract

We study the realization of two-channel optical router in parametrically amplified four-wave mixing (PA-FWM) process in rubidium atomic system. Here, we report the first level routing action resulting from the PA-FWM process and the second level routing resulting from the optical nonreciprocity. We also find the channel equalization ratio and optical fidelity of this router can be controlled by the phase of dressing beams. The switching speed of this system is about 18 ns, which can potentially contribute to quantum routing.

DOI
10.1109/lpt.2018.2805020

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Abstract We investigate the realization of correlated light beams in parametrically amplified six-wave mixing (PA-SWM) process in a rubidium atomic ensemble. By applying the single external-dressing field into the parametrically amplified four-wave mixing (PA-FWM), we dressed PA-FWM as the superposition of pure PA-FWM and pure PA-SWM by Taylor expansion. Moreover, the phases of PA-FWM and PA-SWM could be adjusted, which results in a constructive or destructive interaction. Besides, the parametric gain of PA-SWM is high, from 0 to 10, and can be controlled by phases. The outcomes of this investigation can potentially contribute to the development of quantum information processing.
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Abstract We report that the optical gain and intensity difference squeezing (IDS) of four-wave mixing can be controlled using an external dressing field in a hot rubidium atomic system. The intensity of the parametric amplified four-wave mixing (PA-FWM) signal in the probe and corresponding conjugate channels can be enhanced using the dressed effect, resulting in an increase of the optical gain. So, the IDS in the dressed PA-FWM has a higher degree of −7.1 dB, as compared to that in the PA-FWM of −2.5 dB. This scheme of enhancing the optical gain and the generated IDS requires a simple experimental setup that is mechanically stable. These outcomes can be used in the fabrication of quantum devices and the realization of quantum metrology.
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