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Applied Physics B

Vacuum-induced suppression and enhancement of four-wave mixing in an optical cavity

Haixia Chen, Xiuxiu Wang, Irfan Ahmed, Xin Yao, Zhenkun Wu, Dayu Zhu, Yanpeng Zhang

Published Aug 3, 2015• 6 citations
Publisher
DOI
10.1007/s00340-015-6194-x

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We report experimental observation of the enhancement and suppression of four-wave mixing and six-wave mixing (SWM) inside a ring cavity containing a rubidium atomic cell. greatly amplifies the SWM enhancement peak and suppression dip, and the vacuum induced Kerr nonlinear phase shift results in the asymmetric phenomenon of the SWM dressing effect. Additionally, we study the power switch and the destructive interference between multi-photon processes. Such investigation results can find applications in all-optical switches and optical communications.
Abstract We demonstrate the influence of dressed states on two-mode optical entanglement in a double Λ-type energy level atomic ensemble of parametric amplification four-wave mixing (PA-FWM) processes. By injecting a coherent or Einstein–Podolsky–Rosen field into PA-FWM channels, we investigate the corresponding entanglement. The quantum entanglement may be enhanced or suppressed via a bright state or a dark state. In free space, the two-mode entanglement is determined by nonlinear gain, which can be manipulated by field dressing in an atomic ensemble (i.e. Autler–Towns splitting, dressed enhancement/suppression of entanglement). However, in a ring cavity, the cavity dressing brings about the AT-like splitting of entanglement. Such an entanglement profile may be modified by field dressing through vacuum Rabi splitting, vacuum-induced enhancement and suppression of entanglement.
Quantum vacuum noise is very detrimental for photon propagation and optical quantum memory, which particularly occurs in optically thick atomic media working under the condition of electromagnetically induced transparency (EIT) accompanied by a process of four-wave mixing (FWM). The suppression of quantum vacuum noise becomes now an imperative task for advancing the research and application of quantum memory. Here we present a scheme to suppress quantum vacuum noise and hence to improve the fidelity of photon propagation, by assuming that signal and idler laser fields are initially prepared in a two-mode squeezed vacuum state. With such a scheme, we show that the normal gain mode inherent in the EIT-based FWM system, which contributes optical gain to both the signal and idler fields, can be largely inhibited, giving rise to a significant suppression of the quantum vacuum noise along with their amplification and hence a large enhancement of the fidelity for photon propagation. The results reported here may have promising applications for high-fidelity quantum information processing and transformation, especially for improving the quality of multimode optical quantum memory based on EIT techniques.