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Videos de Conceptos Relacionados

Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...

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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Memoria atómica para estados de fotones correlacionados.

C H van der Wal1, M D Eisaman, A André

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|May 24, 2003
PubMed
Resumen

Los investigadores controlaron el retraso entre dos pulsos de luz correlacionados utilizando el almacenamiento atómico en átomos de rubidio. Esta técnica de comunicación cuántica se basa en la dispersión de Raman y la conversión coherente para un control de tiempo preciso.

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Área de la Ciencia:

  • La óptica cuántica es una óptica cuántica.
  • Física atómica La física atómica es la física de los átomos.
  • La óptica no lineal es la óptica no lineal.

Sus antecedentes:

  • El entrelazamiento cuántico permite protocolos de comunicación seguros.
  • El control de las propiedades temporales de los fotones entrelazados es crucial para el procesamiento de información cuántica.

Objetivo del estudio:

  • Para demostrar un control coherente sobre el retraso de tiempo entre pares de fotones entrelazados.
  • Explorar el uso de conjuntos atómicos para la manipulación temporal de los estados cuánticos.

Principales métodos:

  • Utilizando la dispersión de Raman para generar pares de átomos y fotones con giro invertido.
  • Empleando el almacenamiento temporal de estados fotónicos en un conjunto atómico de rubidio.
  • Conversión coherente de estados atómicos en un haz de fotones retrasados.

Principales resultados:

  • Demostración experimental de dos pulsos de luz correlacionados mecánicamente cuánticos.
  • Control coherente sobre el retraso de tiempo entre los pulsos a través del almacenamiento atómico.
  • Generación exitosa de haces de fotones retrasados a través de procesos ópticos resonantes no lineales.

Conclusiones:

  • Los conjuntos atómicos proporcionan una plataforma viable para el control temporal de los estados cuánticos.
  • El proceso óptico resonante no lineal demostrado es prometedor para aplicaciones de comunicación cuántica.
  • El manejo temporal preciso de fotones entrelazados se puede lograr utilizando esta técnica.