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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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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...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
937
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

963
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
963
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Updated: May 16, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Microwave quantum heterodyne sensing using a continuous concatenated dynamical decoupling protocol.

Charlie J Patrickson1, Valentin Haemmerli2, Shi Guo2

  • 1Department of Engineering, University of Exeter, Exeter, UK. cp728@exeter.ac.uk.

Nature Communications
|May 12, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a continuous microwave scheme to enhance spin coherence for precise magnetic field measurements. The new method achieves high amplitude and phase sensitivity, improving quantum sensing in 2D materials.

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Area of Science:

  • Quantum sensing
  • Condensed matter physics
  • Nanoscale magnetic field detection

Background:

  • Quantum heterodyne schemes offer high precision for AC signals but struggle with spin coherence in broadened systems.
  • Limited spin coherence protection impacts amplitude sensitivity in existing protocols.

Purpose of the Study:

  • To develop a continuous microwave scheme that extends spin coherence and improves magnetic field measurement sensitivity.
  • To resolve frequency, amplitude, and phase of MHz to GHz magnetic fields with enhanced precision.

Main Methods:

  • Implemented a continuous microwave scheme to extend spin coherence.
  • Utilized an ensemble of boron vacancies in hexagonal boron nitride as the sensing platform.
  • Integrated the scheme with quantum heterodyne detection.

Main Results:

  • Achieved extended spin coherence towards the effective limit.
  • Demonstrated high amplitude sensitivity () and phase sensitivity ( ) for magnetic fields.
  • Recorded a GHz signal with sub-Hertz resolution and high signal-to-noise ratio (SNR=235) over 10s.

Conclusions:

  • The developed scheme significantly enhances spin coherence and magnetic field sensitivity.
  • Compatibility with quantum heterodyne detection enables high-resolution GHz signal recording.
  • This advancement in 2D materials opens avenues for probing nanoscale condensed matter systems.