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Laser Physics

Controlling correlations in the Rydberg-dressing six-wave mixing process

Zhaoyang Zhang, Danmeng Ma, Jun-Feng Liu, Irfan Ahmed, Hao Tian, Junling Che, Haijun Tang, Faizan Raza, Yanpeng Zhang

Published Dec 1, 2016• 3 citations
Publisher

Abstract

Abstract We report the experimental observation of intensity noise correlation between six-wave mixing (SWM), fluorescence and probe transmission signal in a coherently prepared Rydberg atomic ensemble. With the assistance of the electromagnetically induced transparency (EIT) technique, the Rydberg SWM is generated with high efficiency. Then the correlation between the probe transmission and SWM, the anti-correlation between the probe and fluorescence, and the anti-correlation between SWM and fluorescence occur, with these being caused by the enhanced dispersion and nonlinearity in the Rydberg-EIT medium. Such intensity correlation can be effectively controlled by the strong Rydberg-dressing effect. This investigation can potentially contribute to the further study of multi-field quantum correlations and anti-correlations via atomic spin coherence.

DOI
10.1088/1555-6611/27/1/015403

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Abstract We report the experimental observation of intensity noise correlation between six-wave mixing (SWM), fluorescence and probe transmission signal in a coherently prepared Rydberg atomic ensemble. With the assistance of the electromagnetically induced transparency (EIT) technique, the Rydberg SWM is generated with high efficiency. Then the correlation between the probe transmission and SWM, the anti-correlation between the probe and fluorescence, and the anti-correlation between SWM and fluorescence occur, with these being caused by the enhanced dispersion and nonlinearity in the Rydberg-EIT medium. Such intensity correlation can be effectively controlled by the strong Rydberg-dressing effect. This investigation can potentially contribute to the further study of multi-field quantum correlations and anti-correlations via atomic spin coherence.
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In this paper, we theoretically and experimentally demonstrate a novel nondestructive optical detection method by coherently exciting and controlling the electromagnetically induced transparency (EIT)-assisted six-wave mixing (SWM) process of S state Rydberg atoms in 85Rb vapour. By analysing the evolution regularity of the resonant SWM signals under various conditions, one can control the signal by altering the atom density and detuning and the strengths of the probe and coupling fields. The characteristics of this SWM process provide a potential application for spectroscopy physics and determining the interactions between optical fields and atoms.
The authors have considered the coexisting dressed four-wave mixing (FWM) and six-wave mixing (SWM) in an open four-level inverted Y configuration. The authors also report an experimental observation of optical pumping-assisted FWM and electromagnetically induced transparency (EIT)-assisted SWM. The efficient SWM can be selected by EIT window and controlled by the coupling as well as dressed field detuning and power. Due to EIT and optical pumping assistance, the enhanced SWM signal is more than ten times lager than the coexisting FWM signal.
We study the parametric amplification of electromagnetically induced transparency-assisted Rydberg six- and eight-wave mixing signals through a cascaded nonlinear optical process in a hot rubidium atomic ensemble both theoretically and experimentally. The shift of the resonant frequency (induced by the Rydberg–Rydberg interaction) of parametrically amplified six-wave mixing signal is observed. Moreover, the interplays between the dressing effects and Rydberg–Rydberg interactions in parametrically amplified multiwave mixing signals are investigated. The linear amplification of Rydberg multiwave mixing processes with multichannel nature acts against the suppression caused by Rydberg–Rydberg interaction and dressing effect.
We experimentally and theoretically investigate the Rydberg six-wave mixing (SWM) process in 85 Rb atomic vapor. Through comparing the center frequency positions of resonant Rydberg SWM signals with different atomic densities, atomic levels induced by van der Waals interaction are observed. Meanwhile, such SWM process which is sensitive to blockade can be modulated by the self-dressing effect and/or external dressing effect. In addition, the Rydberg eight-wave mixing process can be obtained if the power of the external dressing field is low. Such blockaded multi-wave mixing process has potential applications in multi-channel quantum information.
Atoms excited to Rydberg states can be used to enhance the nonlinearity of medium via electromagnetic induced transparency (EIT) due to their special property. In this letter, focusing on a Rydberg medium with strong nonlinearity, we investigate the space imaging characteristics of generating Rydberg EIT-assisted six-wave mixing in a K-type five-level atomic system. Rydberg spatial image variation regularity modulated by an optical field was obtained. This study on the regulation of image variation was able to establish a relation between the refractive index of the Rydberg medium and optical field, which will not only expand research on Rydberg space optical phenomena but can also provide the basis for advanced designs that are highly dependent on the refractive index materials. More importantly, these results have research value in the field of optical information processing.