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Videos de Conceptos Relacionados

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...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

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Updated: Jun 10, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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Published on: September 5, 2019

El entrelazamiento cuántico entre un fotón óptico y un qubit de espín de estado sólido.

E Togan1, Y Chu, A S Trifonov

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

Nature
|August 6, 2010
PubMed
Resumen

Los investigadores lograron el entrelazamiento cuántico entre un solo fotón óptico y un qubit de estado sólido. Este avance en las redes cuánticas utiliza un centro de vacío de nitrógeno en el diamante para la comunicación cuántica avanzada y la investigación fundamental.

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Área de la Ciencia:

  • La física cuántica es la física cuántica.
  • Ciencias de la información cuántica Ciencias de la información cuántica.
  • Física del estado sólido Física del estado sólido

Sus antecedentes:

  • El entrelazamiento cuántico es un fenómeno clave en la mecánica cuántica, crucial para el procesamiento de información cuántica.
  • Los fotones entrelazados son vitales para la criptografía cuántica y las pruebas fundamentales de la mecánica cuántica.
  • Investigaciones anteriores enredaron fotones con átomos e iones para redes cuánticas, pero la integración del estado sólido siguió siendo un desafío.

Objetivo del estudio:

  • Para establecer el entrelazamiento cuántico entre un solo fotón óptico y un qubit de estado sólido.
  • Demostrar una nueva fuente de entrelazamiento para redes ópticas cuánticas.
  • Mostrar un control avanzado sobre las interacciones de la materia ligera en sistemas de estado sólido.

Principales métodos:

  • Utilizó un solo fotón óptico enredado con el giro de un centro de vacío de nitrógeno (NV) en diamante.
  • Empleó la técnica del borrador cuántico para la verificación experimental del entrelazamiento.
  • Centrado en la polarización del fotón y el espín electrónico del centro NV.

Principales resultados:

  • Realizó con éxito el entrelazamiento cuántico entre la polarización de un fotón y un qubit de estado sólido (centro NV).
  • Demostró un alto grado de control en la interacción entre el qubit de estado sólido y el campo de luz cuántica.
  • El entrelazamiento verificado usando la técnica de borrado cuántico, confirmando las correlaciones cuánticas.

Conclusiones:

  • La fuente de entrelazamiento desarrollada es un paso significativo hacia las redes ópticas cuánticas de estado sólido.
  • Este trabajo proporciona un bloque de construcción clave para los futuros sistemas de computación y comunicación cuántica.
  • El control demostrado sobre las interacciones luz-materia abre nuevas vías para estudios cuánticos fundamentales.