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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...
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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...
The Pauli Exclusion Principle03:06

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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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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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Related Experiment Video

Updated: Jun 14, 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

Single-spin readout in a double quantum dot including a micromagnet.

Yun-Sok Shin1, Toshiaki Obata, Yasuhiro Tokura

  • 1Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan. shin@meso.t.u-tokyo.ac.jp

Physical Review Letters
|April 7, 2010
PubMed
Summary

We demonstrate spin-selective readout of quantum dot electron spins using photon-assisted tunneling (PAT) and a micromagnet-generated inhomogeneous magnetic field. This method allows for precise control and detection of spin states in quantum computing architectures.

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Area of Science:

  • Quantum Computing
  • Spintronics
  • Condensed Matter Physics

Background:

  • Quantum dots are promising candidates for qubits.
  • Spin-selective readout is crucial for quantum information processing.
  • Controlling and measuring individual electron spins is a key challenge.

Purpose of the Study:

  • To demonstrate a novel spin-selective readout technique for double quantum dots.
  • To utilize photon-assisted tunneling (PAT) and an inhomogeneous Zeeman field for spin detection.
  • To enable precise manipulation and measurement of electron spin states.

Main Methods:

  • Employing photon-assisted tunneling (PAT) in a double quantum dot system.
  • Generating an inhomogeneous Zeeman field using a proximal micromagnet.
  • Applying external magnetic fields to control spin state populations.
  • Utilizing charge detection to probe PAT-induced charge delocalization.

Main Results:

  • Achieved spin-selective PAT readout by exploiting energy differences between spin states.
  • Demonstrated the ability to modify and detect relative spin-state filling weights.
  • Showcased the sensitivity of PAT to charge delocalization in the double dot.

Conclusions:

  • The developed technique offers a viable method for spin readout in quantum dots.
  • This approach is essential for advancing scalable quantum computing architectures.
  • The combination of PAT and inhomogeneous fields provides a powerful tool for quantum spintronics research.