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Laser Physics

Phase controlled six-wave mixing parametrical amplification to yield correlated light beams

Kangkang Li, Pargorn Puttapirat, Yang Liu, Weiqi Jiang, Al Imran, Mady-Kotta Lysa Marlyne, Renan Bu, Yanpeng Zhang

Published May 25, 2018• 1 citation
Publisher

Abstract

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.

DOI
10.1088/1555-6611/aabec4

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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 In this paper, we demonstrate that the intensity difference squeezing (IDS) of parametric amplified four-wave mixing (PA-FWM) can be modulated by the phase-sensitive dressed effect in a hot rubidium (Rb) atomic system. The introduction of phase-sensitive dressed effect can enhance the degree of IDS of PA-FWM to −8.1 dB, as compared to that in the phase-insensitive dressed PA-FWM of −6.6 dB. The phase-sensitive dressing field can not only enhance the degree of IDS of PA-FWM by the dressed effect, but can also be treated as the seed beam of the PA-six wave mixing process. So, double-injected three-mode IDS obviously has a bigger degree of IDS compared with the single-injection case. One advantage of the current scheme for enhancing the generated IDS is that the experimental setup is simple and mechanically stable. These outcomes can be used in the fabrication of quantum devices and the realization of quantum metrology.
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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We theoretically investigate the influence of a dressing field on parametric amplification multi-wave mixing (PA-MWM) processes in an atomic ensemble for the first time. The quantum spatial properties of PA-MWM signals are demonstrated by studying the cone emissions. Meanwhile, we investigate the intensities, the intensity difference squeezing, and the intensity noise correlation of bright twin PA-MWM beams, which are generated by injecting the MWM signals into the input ports of a spontaneous parametric four-wave mixing process. Both the spatial properties and the quantum correlation can be enhanced or suppressed via a bright state or a dark state, which is induced by the single or double dressing effect. This study has potential applications in quantum security, quantum imaging and long distance quantum communications.