Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.1K
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...
2.1K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

789
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
789
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.3K
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...
1.3K
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

5.3K
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...
5.3K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.3K
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.
1.3K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.3K
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...
3.3K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Two-qubit logic and teleportation with mobile spin qubits in silicon.

Nature·2026
Same author

Many-body interferometry with semiconductor spins.

Science (New York, N.Y.)·2026
Same author

Demonstration of an always-on exchange-only spin qubit.

Nature communications·2026
Same author

Robust and localised control of a 10-spin qubit array in germanium.

Nature communications·2025
Same author

Operating two exchange-only qubits in parallel.

Nature·2025
Same author

High-fidelity single-spin shuttling in silicon.

Nature nanotechnology·2025
Same journal

A native sulfur deposit in Gale crater, Mars.

Science (New York, N.Y.)·2026
Same journal

Coordinated demise of harmful algal blooms.

Science (New York, N.Y.)·2026
Same journal

Genetic effects put into context.

Science (New York, N.Y.)·2026
Same journal

Bacteria share proteins to survive antibiotics.

Science (New York, N.Y.)·2026
Same journal

Impacts shaped Earth's first continents.

Science (New York, N.Y.)·2026
Same journal

Erratum for the Report "Covalently bonded single-molecule junctions with stable and reversible photoswitched conductivity" by C. Jia <i>et al</i>.

Science (New York, N.Y.)·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Feb 17, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

17.0K

Puerta CNOT impulsada por resonancia para giros de electrones

D M Zajac1, A J Sigillito1, M Russ2

  • 1Department of Physics, Princeton University, Princeton, NJ 08544, USA.

Science (New York, N.Y.)
|December 9, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una puerta CNOT rápida y de alta fidelidad para los espines de electrones en puntos cuánticos de silicio. Este avance hace avanzar la computación cuántica universal al permitir operaciones robustas de dos qubits esenciales para algoritmos complejos.

Más Videos Relacionados

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

15.5K
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

10.3K

Videos de Experimentos Relacionados

Last Updated: Feb 17, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

17.0K
Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

15.5K
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

10.3K

Área de la Ciencia:

  • La computación cuántica
  • Ciencia de la información cuántica
  • Física del estado sólido

Sus antecedentes:

  • La computación cuántica universal se basa en puertas de un solo qubit y dos qubits de alta fidelidad.
  • Los giros de electrones en el silicio ofrecen una plataforma prometedora para los qubits, pero las puertas CNOT robustas han sido obstaculizadas por el ruido.
  • Los esfuerzos anteriores se enfrentaron a desafíos con la desfase de espín nuclear y el ruido de carga, lo que limita el rendimiento de la puerta CNOT.

Objetivo del estudio:

  • Para demostrar una puerta CNOT eficiente y de alta fidelidad para los espines de electrones en silicio.
  • Para superar las limitaciones de la desfase de espín nuclear y el ruido de carga en arquitecturas de puntos cuánticos.
  • Para permitir la implementación de algoritmos multi-qubit en procesadores cuánticos basados en silicio.

Principales métodos:

  • Utilizó operaciones de puerta CNOT impulsadas por resonancia en espines de electrones dentro de un dispositivo de punto cuántico de silicio.
  • Se han logrado rotaciones de un solo qubit con fidelidades superiores al 99%, verificadas mediante análisis comparativo aleatorio.
  • Acoplamiento de intercambio controlado para implementar la puerta cuántica CNOT con conducción resonante en aproximadamente 200 nanosegundos.

Principales resultados:

  • Demostró una puerta CNOT impulsada por resonancia para giros de electrones en silicio con alta fidelidad.
  • Logró una fidelidad de rotación de un solo qubit superior al 99%.
  • Generó un estado de Bell con una fidelidad del 78% utilizando la puerta CNOT implementada, después de corregir los errores de preparación y medición del estado.

Conclusiones:

  • El CNOT desarrollado es un bloque de construcción eficiente y robusto para la computación cuántica basada en silicio.
  • La arquitectura del dispositivo de punto cuántico facilita la implementación de algoritmos multi-qubit.
  • Este trabajo representa un paso significativo hacia la computación cuántica escalable y tolerante a fallos en silicio.