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
Efficient two-dimensional atom localization via spontaneously generated coherence and incoherent pump
Tao Shui,Zhiping Wang,Benli Yu +2 more
TL;DR: In this paper, a simple scheme of two-dimensional (2D) atom localization controlled by spontaneously generated coherence (SGC) and incoherent pump in a closed Λ-type three-level atomic system was presented.
Journal ArticleDOI
Controllable amplification and absorption properties in coupled-double-quantum-wells with tunneling-induced interference
TL;DR: In this article, the authors investigate optical amplification and absorption properties under a closed-loop double-Λ configuration in an asymmetric semiconductor coupled-double-quantum-well (CDQW) nanostructure based on interband transitions (IBTs).
Journal ArticleDOI
Two-dimensional atom localization via two standing-wave fields in a four-level atomic system
TL;DR: In this article, a scheme for the 2D localization of an atom in a four-level Y-type atomic system is proposed, where two orthogonal standing-wave fields are applied at some special positions, leading to the formation of sub-wavelength 2D periodic spatial distributions.
Journal ArticleDOI
Transient absorption and lasing without inversion in an artificial molecule via Josephson coupling energy
TL;DR: In this article, the authors investigated the dynamical behavior of the absorption in a superconducting quantum circuit with a tunable V-type artificial molecule constructed by two super-conducting Josephson charge qubits coupled with each other through a quantum interference device and found that the ratio of the Josephson coupling energy to the capacitive coupling strength provided an extra controlling parameter for manipulating transient absorption behaviors.
Journal ArticleDOI
Phase control of light propagation via Fano interference in asymmetric double quantum wells
Abstract: We investigate the light propagation and dynamical control of a weak pulsed probe field in asymmetric double quantum wells via Fano interference, which is caused by tunneling from the excited subbands to the same continuum. Our results show that the system can produce anomalous and normal dispersion regions with negligible absorption by choosing appropriate coupling strength of the tunneling and the Fano interference. Interesting enough, the dispersion can be switched between normal and anomalous by adjusting the relative phase between the pulsed probe and coherent control fields owing to the existence of the perfectly Fano interference. Thus, the relative phase can be regarded as a switch to manipulate light propagation with subluminal or superluminal. The temporal and spatial dynamics of the pulsed probe field with hyperbolic secant envelope are analyzed.
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.
Journal ArticleDOI
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.