Topic
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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15 Mar 2023
TL;DR: In this paper , the spontaneous six-wave mixing (SSWM) scheme was used to generate W-class triphotons with an unprecedented generation rate in a four-level triple-Λ atomic vapor cell.
Abstract: Abstract Sources of entangled multiphotons are not only essential for fundamental tests of quantum foundations, but are also the cornerstone of a variety of optical quantum technologies today. Over past three decades, tremendous efforts have been devoted to creating multiphoton entanglement by multiplexing existing biphoton sources with linear optics and postselections. Different from all previous protocols, here we report, for the first time, the observation of continuous-mode time-energy-entangled W-class triphotons with an unprecedented generation rate directly through the process of spontaneous six-wave mixing (SSWM) in a four-level triple-Λ atomic vapor cell. Facilitated by electromagnetically induced transparency and coherence control, our SSWM scheme enables versatile narrowband triphoton generation with many intriguing properties including long temporal coherence and controllable waveforms, ideal for implementing long-distance quantum communications, networking, and information processing by interfacing photons and atoms. Most importantly, our work paves a way for the development of a reliable and efficient genuine triphoton source, thus making the research on multiphoton entanglement within easy reach.
TL;DR: In this paper, a new technique of Quantum Non-Demolition Measurement of a projection of canonical momentum of a three level Λ atom is proposed, based on the detection of a Stokes component of two counter-propagating probe electromagnetic waves, interacting with the atom.
01 Jan 1994
TL;DR: In this article, the atomic coherence rule of solids is used in the model simulation of the amorphous Si 3 N 4, the results are compared with experiment and the possible construction of the real Si 3 n 4 and the validity of coherence rules is discussed.
Abstract: The atomic coherence rule of solids is used in the model simulation of the amorphous Si 3 N 4 , the results are compared with experiment. The possible construction of the real amorphous Si 3 N 4 and the validity of coherence rule used in the model simulation of amorphous are discussed.
TL;DR: In this article, the authors demonstrate light splitting with moving atoms in a paraffin coated vapor cell, by using phase sensitive degenerate four wave mixing, or self-rotation.
Abstract: Using atomic motion to coherently spread light information stored in atoms provides a novel means to manipulate atom-light interactions. We demonstrate light splitting with moving atoms in a paraffin coated vapor cell, by using phase sensitive degenerate four wave mixing, or self-rotation. This scheme amplifies the beam splitter signal, and in the meantime maintains the phase coherence between the beam splitter channels. Light storage efficiency in the beam-splitting channel can be also enhanced. Such an amplified beam splitter should have applications in optical memory, optical routers and atomic coherence control.
15 Jun 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.