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IEEE Journal of Quantum Electronics

Amplifier and Router of Parametric Amplified Four-Wave Mixing

Haijun Tang, Irfan Ahmed, Dan Zhang, Lin Cheng, Junling Che, Enling Li, Yanpeng Zhang

Published Jan 25, 2018• 1 citation
Publisher

Abstract

We investigated an optical amplifier and router by the aperture nonlinear phase and the phase angle of parametric amplified four-wave mixing in a thermal rubidium vapor. The three-stage optical amplifier has been realized and the total amplified gain is observed up to 10. The router action results from the multi-peaks (multi-pair two-modes) while the cross talk of router can be realized by the opposite dressing shift of composite Autler-Townes splitting.

DOI
10.1109/jqe.2018.2797892

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We investigated an optical amplifier and router by the aperture nonlinear phase and the phase angle of parametric amplified four-wave mixing in a thermal rubidium vapor. The three-stage optical amplifier has been realized and the total amplified gain is observed up to 10. The router action results from the multi-peaks (multi-pair two-modes) while the cross talk of router can be realized by the opposite dressing shift of composite Autler-Townes splitting.
We study the realization of two-channel optical router in parametrically amplified four-wave mixing (PA-FWM) process in rubidium atomic system. Here, we report the first level routing action resulting from the PA-FWM process and the second level routing resulting from the optical nonreciprocity. We also find the channel equalization ratio and optical fidelity of this router can be controlled by the phase of dressing beams. The switching speed of this system is about 18 ns, which can potentially contribute to quantum routing.
We study the realization of an optical transistor (switch and amplifier) and router in multi-order fluorescence (FL) and spontaneous parametric four-wave mixing (SP-FWM). We estimate that the switching speed is about 15 ns. The router action results from the Autler-Townes splitting in spectral or time domain. The switch and amplifier are realized by dressing suppression and enhancement in FL and SP-FWM. The optical transistor and router can be controlled by multi-parameters (i.e., power, detuning, or polarization).
Abstract A higher degree of entanglement of entangled sources in quantum communications is always desired and can be achieved with high nonlinear gains. The dressing of atomic coherence and optical pumping can be considered as effective parameters to obtain such entangled sources. In this regard, we have experimentally studied doubly dressed effects in a small range of frequency, and optical pumping and de-pumping effects over a wide frequency range in multi-level atomic system in order to enhance the nonlinear gain. The multi-mode phenomenon that results from the multi-peak of Autler–Townes splitting can be observed at the large beam size of the pinhole of the pump field. Theoretical calculations fit well with the experimentally measured results. The dressing of atomic coherence and optical pumping lead to the enhancement of nonlinear gain up to 8.2 when the original nonlinear gain is 4.7.
We realized an optical transistor and router utilizing multi-order fluorescence and spontaneous parametric four-wave mixing. Specifically, the optical routing action was derived from the results of splitting in the intensity signal due to a dressing effect, whereas the transistor as a switch and amplifier was realized by a switching correlation and squeezing via a nonlinear phase. A substantial enhancement of the optical contrast was observed for switching applications using correlation and squeezing contrary to the intensity signal. Moreover, the controlling parameters were also configured to devise a control mechanism for the optical transistor and router.
With a forward cone emitting from the strong pump laser in a thermal rubidium atomic vapor, we investigate the non-degenerate parametrically amplified four-wave mixing (PA-FWM) process with dressing effects in a three-level "double-Λ" configuration both theoretically and experimentally. By seeding a weak probe field into the Stokes or anti-Stokes channel of the FWM, the gain processes are generated in the bright twin beams which are called conjugate and probe beams, respectively. However, the strong dressing effect of the pump beam will dramatically affect the gain factors both in the probe and conjugate channels, and can inevitably impose an influence on the quantum effects such as entangled degree and the quantum noise reduction between the two channels. We systematically investigate the intensity evolution of the dressed gain processes by manipulating the atomic density, the Rabi frequency and the frequency detuning. Such dressing effects are also visually evidenced by the observation of Autler-Townes splitting of the gain peaks. The investigation can contribute to the development of quantum information processing and quantum communications.