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

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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...
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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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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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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...
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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632
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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Updated: Jun 16, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Polarimetry with Spins in the Solid State.

Lorenzo Peri1,2, Felix-Ekkehard von Horstig1,3, Sylvain Barraud4

  • 1Quantum Motion, 9 Sterling Way, London, N7 9HJ, United Kingdom.

Nano Letters
|May 7, 2025
PubMed
Summary
This summary is machine-generated.

We extend polarimetry to the third dimension by analyzing spin readout in quantum computers. Spin misalignment, caused by spin-orbit coupling, limits spin readout fidelity in semiconductor quantum computing systems.

Keywords:
Pauli Spin BlockadePolarimetryQuantum DotsSpin QubitsSpinsSpin−Orbit Coupling

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Area of Science:

  • Quantum Computing
  • Spintronics
  • Optics

Background:

  • Polarimetry measures light polarization rotation, crucial in various scientific fields.
  • Pauli spin-blockade (PSB) is a key spin readout mechanism in semiconductor quantum computers.

Purpose of the Study:

  • To reframe Pauli spin-blockade (PSB) as a 3D extension of polarimetry.
  • To investigate spin misalignment in quantum dot systems and its impact on spin readout fidelity.

Main Methods:

  • Performed spin polarimetry using a silicon quantum dot coupled to a boron acceptor.
  • Investigated the influence of spin-orbit coupling on spin misalignment.

Main Results:

  • Demonstrated that spin-orbit coupling induces spin misalignment during spin readout.
  • Showed that spin misalignment fundamentally limits the fidelity of spin readout in PSB-based quantum computers.
  • Identified that rotating the magnetic field orientation can restore perfect spin alignment.

Conclusions:

  • Pauli spin-blockade can be understood as a third-dimensional extension of polarimetry.
  • Spin misalignment is a critical factor limiting quantum computing performance.
  • Understanding and mitigating spin misalignment is essential for advancing semiconductor quantum computing.