Journal ArticleDOI
Highly efficient four-wave mixing in double- Λ system in ultraslow propagation regime
Ying Wu,Ying Wu,Xiaoxue Yang +2 more
TLDR
In this article, a time-dependent analysis of four-wave mixing in an ultraslow-propagation regime was performed and the authors obtained the analytical expressions of pulsed probe laser, FWM-generated pulse, phase shifts and absorption coefficients, group velocities, and FWM efficiency.Abstract:
We perform a time-dependent analysis of four-wave mixing (FWM) in a double-$\ensuremath{\Lambda}$ system in an ultraslow-propagation regime and obtain the analytical expressions of pulsed probe laser, FWM-generated pulse, phase shifts and absorption coefficients, group velocities, and FWM efficiency. With these analytical expressions, we show that an efficiently generated FWM field can acquire the same ultraslow group velocity $({V}_{g}∕c\ensuremath{\sim}{10}^{\ensuremath{-}4}--{10}^{\ensuremath{-}5})$ and pulse shape of a probe pump and that the maximum FWM efficiency is greater than 25%, which is orders of magnitude larger than previous FWM schemes in the ultraslow-propagation regime.read more
Citations
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Journal ArticleDOI
Entanglement via atomic coherence induced by two strong classical fields
TL;DR: In this article, the authors proposed a scheme to achieve the fully tripartite continuous-variable (CV) entanglement in a $Y$-type atomic system driven by two strong classical fields.
Journal ArticleDOI
Continuous-variable entanglement in a two-mode four-level single-atom laser
TL;DR: In this article, the authors investigate the generation and evolution of continuous-variable entanglement in a two-mode single-atom laser, where the atomic coherence is induced by two classical laser fields (pump and coupling field) driving the corresponding atom transitions.
Journal ArticleDOI
Coherent control of position-dependent probe absorption spectrum in a solid
Zhiping Wang,Benli Yu +1 more
TL;DR: In this paper, the two-dimensional probe absorption spectrum in a four-subband coupled double quantum-well system driven by two orthogonal standing-wave lasers is investigated, and it is shown that due to the quantum interference effect of interacting dark resonances, the 2D spatial distribution of probe spectrum can be easily controlled via adjusting the system parameters.
Journal ArticleDOI
High conversion efficiency in resonant four-wave mixing processes.
TL;DR: A new scheme of the resonant four-wave mixing (FWM) for the frequency up or down conversion, which is more efficient than the commonly-used scheme ofthe non-resonant FWM, and is flexible in choosing the control field intensity.
Journal ArticleDOI
Control of spontaneous emission spectra and simulation of multiple spontaneously generated coherence in a four-level atomic system
TL;DR: In this article, the fluorescence spectrum for a four-level atomic system with three levels coupled with two laser fields in a ladder configuration was investigated, and the uppermost level decays to the fourth level via spontaneous emission.
References
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Giant Kerr nonlinearities obtained by electromagnetically induced transparency.
Holger Schmidt,Atac Imamoglu +1 more
TL;DR: A cross-phase modulation scheme that exhibits a giant, resonantly enhanced nonlinearity, along with vanishing linear susceptibilities, is analyzed and has possible applications in quantum nondemolition measurements and for quantum logic gates.
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Nonlinear Optics at Low Light Levels
TL;DR: In this article, the combination of electromagnetically induced transparency based nonlinear optics and cold atom technology, under conditions of ultra-low light propagation, allows nonlinear processes at energies of a few photons per atomic cross section.
Journal ArticleDOI
Photon Switching by Quantum Interference
TL;DR: In this article, the authors describe a four-state atomic system that absorbs two photons, but does not absorb one photon, but operates at an energy cost of one photon per switching event.