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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors experimentally observed the counterintuitive absorption peaks in the transition spectra of 5S1/2−5P3/2/4D5/2 and 5S 1/2 −5P 3/2+4D3/6/2 in a hot 85Rb vapor.
Abstract: We experimentally observe the counterintuitive absorption peaks in the transition spectra of 5S1/2−5P3/2−4D5/2 and 5S1/2−5P3/2−4D3/2 in a hot 85Rb vapor. These spectra are very different from the spectra observed via double resonance optical pumping or electromagnetically induced transparency in the same transitions. These absorption peaks are from electromagnetically induced absorption due to the two-photon atomic coherence effect. We also investigate the relations between these peaks and the powers of the coupling laser and the probe laser experimentally.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the authors extended the quantum theory of nondegenerate four-wave mixing by including the effects of the finite bandwidth of the driving-pump field and derived the master equation for the cavity-field modes, averaged over the stochastic process.
Abstract: We extend the quantum theory of nondegenerate four-wave mixing by including the effects of the finite bandwidth of the driving-pump field. The interaction of a beam of two-level atoms with the two opposite driving-pump fields that have finite bandwidth inside a bimodal cavity is considered. The master equation for the cavity-field modes, averaged over the stochastic process, is derived. We use our theory to study the effects of phase fluctuations, associated with the driving-pump field, on the generation of two-mode squeezing inside the cavity. The steady-state squeezing is achieved with the same driving-pump field as a local oscillator in the balanced homodyne-detection system. Our results show that, in spite of instantaneous phase locking between the cavity field and the local oscillator, the time-delay effects associated with the exponential decay of atomic coherence relate the steady-state squeezing to the diffusion constant of the driving-pump field.

1 citations

Book ChapterDOI
01 Jan 1989
TL;DR: In this article, the atomic coherence between the two lasing levels was used to obtain lasing without population inversion in a spontaneous emission laser without inversion using the difference between the emission and absorption spectra due to Faro interferences.
Abstract: It is generally the case that lasing requires population inversion in order to overcome the absorption from the lower level. Lasing without inversion can be reached in polarization correlated spontaneous emission laser1 by using the atomic coherence between the two lasing levels. Another interesting possibility for obtaining lasing without inversion was proposed by Harris2 using the difference between the emission and absorption spectra due to Faro interferences.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of the applied field phases and amplitudes on the coherent population trapping behavior in superconducting quantum circuits was investigated, and it was shown that when the relative phase is tuned to 0 or π, the maximal atomic coherence is present and coherent population trapning occurs.
Abstract: We investigate the influences of the-applied-field phases and amplitudes on the coherent population trapping behavior in superconducting quantum circuits. Based on the interactions of the microwave fields with a single Δ-type three-level fluxonium qubit, the coherent population trapping could be obtainable and it is very sensitive to the relative phase and amplitudes of the applied fields. When the relative phase is tuned to 0 or π, the maximal atomic coherence is present and coherent population trapping occurs. While for the choice of π/2, the atomic coherence becomes weak. Meanwhile, for the fixed relative phase π/2, the value of coherence would decrease with the increase of Rabi frequency of the external field coupled with two lower levels. The responsible physical mechanism is quantum interference induced by the control fields, which is indicated in the dressed-state representation. The microwave coherent phenomenon is present in our scheme, which will have potential applications in optical communication and nonlinear optics in solid-state devices.

1 citations

Journal ArticleDOI
01 Jan 2013
TL;DR: The possibility of entanglement degree growth in the presence of an atomic coherence and direct dipole-dipole interaction of atoms has been derived in this article, where the authors considered two-level atoms with the nondegenerate two-photon transitions interacting with two-mode thermal elements in lossless cavity.
Abstract: The entanglement of two two-level atoms with the nondegenerate two-photon transitions interacting with two-mode thermal field in lossless cavity has been considered. The possibility of entanglement degree growth in the presence of an atomic coherence and direct dipole-dipole interaction of atoms has been derived.

1 citations


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