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Atomic coherence

About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.


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Journal ArticleDOI
TL;DR: In this article, a weakly driven cavity QED system with a two-level atom trapped was designed, and it was shown for the first time that the maximal atomic coherence has a perfect correspondence with the optimal photon blockade.
Abstract: There is generally no obvious evidence in any direct relation between photon blockade and atomic coherence. Here instead of only illustrating the photon statistics, we show an interesting relation between the steady-state photon blockade and the atomic coherence by designing a weakly driven cavity QED system with a two-level atom trapped. It is shown for the first time that the maximal atomic coherence has a perfect correspondence with the optimal photon blockade. The negative effects of the strong dissipations on photon statistics, atomic coherence and their correspondence are also addressed. The numerical simulation is also given to support all of our results.

2 citations

Journal ArticleDOI
15 Nov 2019
TL;DR: In this paper, the authors used quantum tomography to obtain W and W-like polarization entanglement states for both circularly and linearly polarized dressings, and demonstrated that strong and weak visibilities can be evoked for both types of dressing fields.
Abstract: In a spontaneous process, laser-polarized dressings produce characteristic triphoton waveforms regarding the oscillation period and coherence time. Correspondingly, circularly polarized dressings make it have longer oscillation periods compared to the effect of linearly polarized dressings attributed to dispersion relation changes, and shorter coherence times owing to the larger dressing field. Given that the optical response of the polarization state of incident light is the dressing field, we can control the averaged three-photon coincidence count rate by adjusting the polarization of the incident light. By performing quantum tomography, we can obtain W and W-like polarization entanglement states. Accordingly, strong and weak visibilities can be evoked for circularly and linearly polarized dressings.

2 citations

Journal ArticleDOI
TL;DR: In this article, the authors demonstrated enhancement of fluorescence emission from helium atoms in terms of ultraviolet and infrared filaments nonlinear interaction in a mixture of argon and helium atomic gases.
Abstract: We demonstrated enhancement of fluorescence emission from helium atoms in terms of ultraviolet and infrared filaments nonlinear interaction in a mixture of argon and helium atomic gases. The seed electrons produced by ultraviolet pulses were accelerated by infrared filaments to kick a significant amount of helium atoms into high-lying excited states. This provided a method to efficiently excite helium atoms through electron collisions for further investigation on electron-ion collisions and their effects on atomic coherence behavior.

2 citations

Proceedings ArticleDOI
30 Jan 2014
TL;DR: In this article, the entanglement of two dipole-coupled superconducting flux qubits with degenerate two-photon transitions was investigated with one-mode super-conducting LC circuits.
Abstract: The entanglement of two dipole-coupled superconducting flux qubits with degenerate two-photon transitions interacting with one-mode superconducting LC circuit has been investigated. The possibility of considerable growth of atomic entanglement due atomic coherence and dipole-dipole interaction has been shown.

2 citations

Journal ArticleDOI
TL;DR: In this article, both stationary and time-dependent regimes of operation, instabilities, and phase squeezing are investigated in the off-resonant correlated-spontaneous-emission laser by numerical calculation.
Abstract: Both stationary and time-dependent regimes of operation, instabilities, and phase squeezing are investigated in the off-resonant two-photon correlated-spontaneous-emission laser by numerical calculation. Initial atomic coherence plays an essential role in lasing without population inversion, phase locking, and phase noise squeezing in the system. Under certain conditions, in the inverted and noninverted regimes alike, the output intensity exhibits bistable behaviors against the initial atomic coherence. Depending on the parameters, the whole or a portion of the upper or lower branch gives stable operations. In the inverted regime, even tristable behavior can be found in a narrow range of parameters. The field evolution and dynamics are studied. Furthermore, phase noise reduction near bistable areas is also investigated. In addition to the lower branch, where from previous studies, it has been known to exist, phase squeezing is also found on the upper branch both with and without population inversion, thus generating a bright source of phase noise squeezed light.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202222
202121
202024
201923
201825