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Experimental generation of triple quantum correlated beams from cascaded four-wave mixing processes

Jietai Jing, Zhongzhong Qin, Leiming Cao, Hailong Wang, A. M. Marino, Weiping Zhang

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We report on our recent experimental results of generating triple quantum correlated beams by using cascaded four-wave mixing processes in hot rubidium vapor. The intensity-difference noise power of the triple beams is 6.5±0.3 dB below the shot noise level (SNL).
DOI
10.1364/cleo_at.2014.jtu4a.41

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Abstract We report the quantum correlated triple beams via cascaded four-wave mixing (CFWM) amplified in single hot atomic vapor. Experimentally, we show that strong quantum correlation of three light beams, among them any two’s quantum correlation is characterized by the maximum value of intensity-difference squeezing (IDS) about −7.8 ± 0.3 dB. We found there is IDS between two idler beams, because two pairs of Einstein–Podolsky–Rosen injections potentially exist in our system. Besides, CFWM can emit three-mode beams at three different frequencies, in which these beams can be well separated in the spatial domain. Moreover, much difference with other methods, the injecting probe field can manipulate the gain and IDS of output three-mode light beams, which is resulting from competition relationship between cascaded two four-wave mixing processes. More interestingly, Autler–Townes splitting of gain peaks of output signals due to dressing effect of pumping fields, will lead to the evolution of measured two- and three-mode IDS from single-mode to multi-mode at frequency domain. This result will provide a multimode quantum resource which can potentially realize multimode entanglement and quantum networks.
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