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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...
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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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...
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...

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Video Experimental Relacionado

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Suprimir la desfase de los qubits de espín por la preparación del estado nuclear.

D J Reilly1, J M Taylor, J R Petta

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

Science (New York, N.Y.)
|August 9, 2008
PubMed
Resumen

Los investigadores desarrollaron un método para controlar los espines nucleares en el arseniuro de galio. Esto reduce significativamente la decoherencia de espín, extendiendo el tiempo de desfase del bit cuántico (qubit) más allá de 1 microsegundo.

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Área de la Ciencia:

  • La computación cuántica es la computación cuántica.
  • Física de los semiconductores física de los semiconductores.
  • Spintronics es una empresa de Spintronics.

Sus antecedentes:

  • Los puntos cuánticos de semiconductores son prometedores para la computación cuántica escalable.
  • Las fluctuaciones de espín nuclear en el arseniuro de galio (GaAs) limitan la coherencia del qubit.
  • Los estados de espín coherentes en puntos cuánticos son esenciales para el procesamiento de información cuántica.

Objetivo del estudio:

  • Desarrollar un método para preparar el entorno de espín nuclear en puntos cuánticos GaAs.
  • Para suprimir las fluctuaciones de espín nuclear y extender los tiempos de desfase de qubits.

Principales métodos:

  • Manipulación de la puerta eléctrica para preparar el entorno de espín nuclear.
  • Utilizando puntos cuánticos de pocos electrones en GaAs.
  • Medición del tiempo de desfase inhomogéneo del estado de espín de dos electrones.

Principales resultados:

  • Las fluctuaciones de espín nuclear suprimidas en aproximadamente un 70%.
  • El tiempo de desfase inhomogéneo se extendió más allá de 1 microsegundo.
  • El estado nuclear preparado es estable durante más de 10 segundos.

Conclusiones:

  • El control eléctrico del entorno de espín nuclear es alcanzable.
  • Este método mejora significativamente la coherencia de los qubits en los puntos cuánticos de GaAs.
  • La técnica ofrece un camino hacia arquitecturas de computación cuántica escalables y robustas.