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Related Concept Videos

NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
853
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.6K
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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.9K
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...
1.9K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.7K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.7K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.4K
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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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Radiofrequency cascade readout of coupled spin qubits.

Jacob F Chittock-Wood1,2,3, Ross C C Leon1, Michael A Fogarty1

  • 1Quantum Motion, London, UK.

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Researchers developed a new radiofrequency electron-cascade readout for silicon spin qubits. This method significantly improves signal-to-noise ratio, enabling faster and more scalable quantum computing with metal-oxide-semiconductor technology.

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Area of Science:

  • Quantum computing
  • Semiconductor device physics
  • Quantum information science

Background:

  • Silicon spin qubits offer a scalable path to quantum processing due to compatibility with semiconductor manufacturing.
  • Current spin readout methods, like proximal charge sensors, introduce architectural complexity and limit qubit connectivity.
  • In situ dispersive readout techniques are more compact but suffer from limited sensitivity.

Purpose of the Study:

  • To develop a more sensitive and compact in situ readout technique for silicon spin qubits.
  • To overcome the sensitivity limitations of existing dispersive readout methods.
  • To enable faster and more scalable quantum information processing in silicon.

Main Methods:

  • A novel radiofrequency electron-cascade readout method was employed.
  • The technique utilizes alternating-current electron co-tunnelling to enhance the dispersive signal.
  • Demonstrated on a natural silicon planar metal-oxide-semiconductor (MOS) quantum dot array.

Main Results:

  • Achieved a signal-to-noise ratio enhancement of over 35 dB.
  • Reduced minimum integration time to 7.6 ± 0.2 µs.
  • Demonstrated high-fidelity singlet-triplet readout and coherent spin control via exchange interaction.

Conclusions:

  • The radiofrequency electron-cascade readout significantly enhances qubit performance.
  • This method paves the way for scalable quantum computing architectures in silicon.
  • Achieved long dephasing times (up to 500 ns) and a high gate quality factor (>10).