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
Three-mode entanglement via atomic coherence induced by strong classical field
TL;DR: In this article, the authors proposed a new scheme to achieve fully three-mode entanglement based on the standard criteria in a four-level atomic system driven by two strong classical fields.
Journal ArticleDOI
Optical bistability and multistability in a graphene quantum system
TL;DR: In this paper , the authors studied optical bistability and optical multistability in a defect medium with a monolayer of graphene quantum system, and they found that by controlling the relative phase between applied lights and elliptical parameter of the coupling light, the enhanced Kerr nonlinearity with probe amplification can be obtained in resonance of probe light.
Journal ArticleDOI
Spontaneous emission properties of a driven five-level atom embedded in photonic crystals
TL;DR: In this paper, the spontaneous emission spectra of a five-level double tripod-type atom embedded in photonic crystals are investigated by means of two external fields driving different atomic transitions, and some interesting phenomena such as spectral line enhancement, spectral line suppression, spectral-line narrowing, the appearance of dark lines, and multi-peak structures can be observed in the spectra by appropriately modulating the available system parameters.
Journal ArticleDOI
Single-photon frequency conversion and multi-mode entanglement via constructive interference on Sagnac Loop
TL;DR: Based on constructive interference in Sagnac waveguide loop, an efficient scheme is proposed for selective frequency conversion and multifrequency modes W entanglement via input-output formalism as mentioned in this paper.
Journal ArticleDOI
Parametric conversion and maximally entangled photon pair via collective excitations in a cycle atomic ensemble
Jia Li,Rong Yu,Xuecheng Yang +2 more
TL;DR: In this paper, the collective effects of photonic emissions and excitations of a three-level cyclic-type system (such as atomic ensemble with symmetry broken, or the chiral molecular gases, or manual “atomic” array with symmetry breaking) were studied.
References
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Journal ArticleDOI
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.