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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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TL;DR: In this article, a general formalism of a three-level atom single-mode system by including arbitrary forms of nonlinearities of both the field and the intensity-dependent atom-field coupling is proposed.
Abstract: A general formalism of a three-level atom single-mode system by including arbitrary forms of nonlinearities of both the field and the intensity-dependent atom–field coupling is proposed. With an arbitrary initial condition, an exact analytical time-dependent solution is presented. The work here extends previous studies in this context. Under the condition of an initial coherent field, the atomic-level occupation probability shows the collapse–revival phenomena, which have different features with different forms of the nonlinearities. We derive an expression for the Pancharatnam phase for the entangled state of the system. It is shown that the Pancharatnam phase explicitly contains information about the statistics of the field and atomic coherence. Also, the influences of the nonlinearities on the squeezing phenomenon and the correlation functions are examined.

13 citations

Journal ArticleDOI
TL;DR: In this article, a simple analytical solution for the propagation of a weak Gaussian pulse in a dense absorptive medium with electromagnetically induced transparency is found, which is applied to the analysis of three regimes: (1) and (2) the pulse spectrum is narrower than the transparency window.
Abstract: A simple analytical solution for the propagation of a weak Gaussian pulse in a dense absorptive medium with electromagnetically induced transparency is found. This solution is applied to the analysis of three regimes: (1) and (2) the pulse spectrum is narrower than the transparency window [which is narrow (1) or wide (2) with respect to the width of the absorption line] and (3) the pulse spectrum is broader than the transparency window. It is shown that the pulse maintains its area in all three regimes and maintains its Gaussian shape but narrows in spectrum in regime 1. In regime 2, the pulse begins to distort after a certain distance. In regime 3, the pulse is split into two parts. One part is an adiabatic part with a spectrum defined by the effective width of the transparency window for a thick medium and the other is an oscillating nonadiabatic part of short duration. The adiabatic part propagates slowly and the nonadiabatic part propagates with a velocity close to the speed of light. Thus in regime 3, the medium acts as a time-frequency filter, separating the narrow and wide spectrum components of the pulse in time at the output of the absorber.

13 citations

Journal ArticleDOI
TL;DR: In this article, a fully quantum mechanical solution of the dissipative motion of an atomic centre-of-mass strongly coupled to a dynamically varying cavity field mode is presented, and the coherence properties of the atomic wave packet and its entanglement to the cavity field are calculated.
Abstract: A fully quantum mechanical solution of the dissipative motion of an atomic centre-of-mass strongly coupled to a dynamically varying cavity field mode is presented. Beyond the statistical properties, such as the temperature and localization of the atom, the coherence properties of the atomic wave packet and its entanglement to the cavity field are calculated. The latter is the source of a nonclassical photon statistics expressed in terms of the Mandel Q parameter. The trapping time of an atom initially localized in a potential well is found to significantly deviate from the semiclassically expected results, which we attribute to the graininess of the photon field.

13 citations

Journal ArticleDOI
TL;DR: In this article, the authors demonstrate a new technique for the mechanical manipulation of atoms with light that may be used to deflect or split an atomic beam, which depends on the existence of an internal superposition state of the atom that is "dark" to resonant excitation by a particular light field.
Abstract: We demonstrate a new technique for the mechanical manipulation of atoms with light that may be used to deflect or split an atomic beam. This technique depends on the existence of an internal superposition state of the atom that is 'dark' to resonant excitation by a particular light field. An atom in a dark state may adiabatically follow a slowly varying light field in such a way that both the internal state and the atom's momentum are changed. Because the dark state never absorbs or fluoresces, the atomic coherence, necessary for atom interferometry, is preserved. We use laser-cooled Cs atoms to demonstrate the transfer of 8 photon momenta from the slowly varying laser field to the atom.

13 citations

Journal ArticleDOI
TL;DR: A collection of cold rubidium atoms in three-level configuration trapped in one dimensional optical lattice is revisited and strong evidence that the nonreciprocal behavior can be greatly enhanced by increasing the spatial modulation amplitude is shown.
Abstract: A collection of cold rubidium atoms in three-level configuration trapped in one dimensional (1D) optical lattice is revisited. The trapped atoms are considered in the Gaussian density distribution and study the realization of P T-, non-P T- and P T anti-symmetry in optical susceptibility in 1D atomic lattices in a periodic structure. Such a fascinating modulation is achieved by spatially modulating the intensity of the driving field. Interestingly, a nonreciprocal optical propagation phenomenon is investigated. In this system, we have introduced a microwave that couples to the two ground states, spatial modulation of the coupling field, and the atomic density with Gaussian distribution in practice. With a proper detuning and coupling field Rabi frequencies, we can find the condition of P T-symmetry along with field propagation direction, and the novel properties of transmission and reflections have been discussed. The large difference of field reflections from the two ends of the atomic lattice medium shows strong evidence that the nonreciprocal behavior can be greatly enhanced by increasing the spatial modulation amplitude.

13 citations


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