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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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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.
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.4K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Stabilization of point-defect spin qubits by quantum wells.

Viktor Ivády1,2, Joel Davidsson2, Nazar Delegan3,4

  • 1Wigner Research Centre for Physics, PO Box 49, H-1525, Budapest, Hungary.

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Engineered quantum wells stabilize qubit charge states in wide bandgap semiconductors. This research presents a materials-based solution for robust quantum computing and single-photon sources, overcoming charge instability and phonon interference challenges.

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Area of Science:

  • Quantum Information Science
  • Materials Science
  • Condensed Matter Physics

Background:

  • Defect-based quantum systems in wide bandgap semiconductors are promising for scalable quantum technologies.
  • These systems face challenges like charge-state instabilities and phonon interference, limiting performance and room-temperature operation.

Purpose of the Study:

  • To identify a method for stabilizing the charge state of qubits in wide bandgap semiconductors.
  • To address optical instability and enhance the room-temperature robustness of color centers for quantum applications.

Main Methods:

  • Utilized density-functional theory (DFT) calculations.
  • Conducted experimental synchrotron X-ray diffraction studies.
  • Developed a model for point defect centers in silicon carbide.

Main Results:

  • Identified a near-stacking fault axial divacancy as a key point defect in silicon carbide.
  • Demonstrated that an engineered quantum well can stabilize the qubit's charge state.
  • Showed the defect model explains robustness against photoionization and room-temperature stability.

Conclusions:

  • A materials-based solution is presented for the optical instability of color centers in semiconductors.
  • The findings pave the way for developing robust single-photon sources and spin qubits.
  • Engineered quantum wells offer a pathway to overcome critical limitations in quantum information technologies.