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Europhysics Letters (EPL)

Rydberg six-wave mixing process

Junling Che, Jiaqi Ma, Huaibin Zheng, Zhaoyang Zhang, Xin Yao, Yiqi Zhang, Yanpeng Zhang

Published Feb 1, 2015• 7 citations
Publisher

Abstract

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.

DOI
10.1209/0295-5075/109/33001

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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.
We report the first experimental observations of the blockaded six- and eight-wave mixing processes in a collective multi-level Rydberg atomic ensemble tailored by multi-channel scissors and created by three coexisting electromagnetically induced transparency (EIT) windows. The interplay between the dressed-state effect and the Rydberg blockade caused by strong van der Waals interactions is investigated when several parameters in the excitation lasers are changed. Blockaded multi-wave mixing (MWM) signals are obtained when the coupling frequency detuning is changed, which is improved to give multiple channels when the probe detuning is scanned. Such MWM signals tailored by EIT scissors produce a much narrower linewidth and therefore are suitable for application in long-distance quantum communication. The advantages of having multi-channel blockaded MWM signals also makes potential applications in demonstrating multi-channel entanglement possible and improves the performance of quantum computation with Rydberg atoms.
Rb vapor both theoretically and experimentally. By use of a disturbance-free optical detection method, the Rydberg EWM characterized by multiple sets of spin coherence is presented via the interplay and competition between the dressing-state effects and excitation blockade caused by strong Rydberg-Rydberg interaction. Such interplay and competition can be demonstrated by the intensity evolutions of multi-wave mixing (MWM) signals via controlling the atomic density, the frequency detuning and Rabi frequencies of corresponding laser fields. The observed Rydberg EWM tailored by EIT windows can possess of much narrower linewidth <30MHz and provide a new way for the study of Rydberg effect in the atomic ensemble above room temperature.
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.
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 enhancement and suppression of the two coexisting six-wave mixing (SWM) processes via atomic coherence have been observed. In the presence of mutual dressing between two SWM signals, the self-dressing effect causes the Autler-Townes (AT) splitting of the SWM signals and the external-dressing effect makes the SWM signals enhanced or suppressed. In addition, the power dependencies of the enhancement and suppression of SWM processes are studied. Theoretical calculations are carried out, which are in good agreement with the experimental results.
We show the enhancement and suppression of a six-wave mixing (SWM) signal in the electromagnetically induced transparency in a five-level 85 Rb atomic system. The results show the Autler—Townes splitting and the enhancement or suppression of SWM, which are caused respectively by a self-dressing effect and by an external dressing effect in the presence of mutual dressing between two SWM signals. In addition, we observe the polarization dependence of the enhancement and suppression of the SWM signals.