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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

49.5K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
49.5K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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.
56.8K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
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...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.0K
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...
3.0K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.4K
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,...
1.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.6K
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...
1.6K

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Quantum Interferometry with a g-Factor-Tunable Spin Qubit.

K Ono1,2, S N Shevchenko3,4,5, T Mori6

  • 1Advanced device Laboratory, RIKEN, Wako-shi, Saitama 351-0198, Japan.

Physical Review Letters
|June 8, 2019
PubMed
Summary
This summary is machine-generated.

We demonstrate spin qubit interferometry in silicon using modulated energy levels. This technique shows potential for quantum computing at higher operating temperatures.

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Related Experiment Videos

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Materials Science

Background:

  • Quantum interference is crucial for qubit operation.
  • Electron spin qubits in silicon are promising for quantum computing.
  • Controlling qubit energy levels is essential for manipulation.

Purpose of the Study:

  • To investigate quantum interference effects in a continuously modulated qubit.
  • To explore the use of spin blockade in a double-dot configuration for qubit readout.
  • To demonstrate spin qubit interferometry in a silicon tunneling field-effect transistor.

Main Methods:

  • Forming a qubit using an impurity electron spin in a silicon tunneling field-effect transistor.
  • Modulating qubit energy levels via gate-voltage-dependent g factors using radio frequency waves (rectangular, sinusoidal, ramp).
  • Probing the energy-modulated qubit using electron spin resonance.

Main Results:

  • Successfully implemented and observed quantum interference effects in the modulated spin qubit.
  • Demonstrated qubit readout via spin blockade in a double-dot configuration.
  • Achieved operation at relatively high temperatures, indicating device robustness.

Conclusions:

  • Spin qubit interferometry is feasible in silicon devices.
  • The demonstrated technique holds potential for scalable quantum information processing.
  • Operation at higher temperatures simplifies experimental requirements and enhances practical applications.