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Related Concept Videos

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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Updated: Jul 3, 2026

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

Suppressing spin qubit dephasing by nuclear state preparation.

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
Summary
This summary is machine-generated.

Researchers developed a method to control nuclear spins in gallium arsenide quantum dots. This significantly reduces spin decoherence, extending the quantum bit (qubit) dephasing time beyond 1 microsecond.

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Area of Science:

  • Quantum computing
  • Semiconductor physics
  • Spintronics

Background:

  • Semiconductor quantum dots are promising for scalable quantum computing.
  • Nuclear spin fluctuations in gallium arsenide (GaAs) limit qubit coherence.
  • Coherent spin states in quantum dots are essential for quantum information processing.

Purpose of the Study:

  • To develop a method for preparing the nuclear spin environment in GaAs quantum dots.
  • To suppress nuclear spin fluctuations and extend qubit dephasing times.

Main Methods:

  • Electrical gate manipulation to prepare the nuclear spin environment.
  • Utilizing few-electron quantum dots in GaAs.
  • Measuring the inhomogeneous dephasing time of the two-electron spin state.

Main Results:

  • Nuclear spin fluctuations suppressed by approximately 70%.
  • Inhomogeneous dephasing time extended beyond 1 microsecond.
  • Prepared nuclear state is stable for over 10 seconds.

Conclusions:

  • Electrical control of the nuclear spin environment is achievable.
  • This method significantly enhances qubit coherence in GaAs quantum dots.
  • The technique offers a pathway towards scalable and robust quantum computing architectures.