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Related Concept Videos

NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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

Spin–Spin Coupling: One-Bond Coupling

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

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

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

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

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...

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Related Experiment Video

Updated: May 8, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Purcell-enhanced spin-phonon coupling with a single colour centre.

Graham Joe1, Michael Haas2, Kazuhiro Kuruma2,3

  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA. grahamjoe20@gmail.com.

Nature
|May 6, 2026
PubMed
Summary
This summary is machine-generated.

Researchers observed the acoustic Purcell effect by creating a nanomechanical resonator around a diamond color center. This enhanced spin relaxation by 10-fold, enabling new quantum control and interconnects.

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Last Updated: May 8, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Area of Science:

  • Quantum physics
  • Solid-state physics
  • Nanotechnology

Background:

  • Emitter radiative properties depend on their environment.
  • The Purcell effect enhances spontaneous emission using electromagnetic resonators.
  • Solid-state emitters interact with acoustic environments via phonons.

Purpose of the Study:

  • To observe the acoustic Purcell effect in a solid-state system.
  • To engineer a nanomechanical resonator for enhanced spin qubit control.
  • To utilize a color center as a probe for nanostructure phonon spectra.

Main Methods:

  • Constructed a microwave-frequency nanomechanical resonator around a diamond color-center spin qubit.
  • Utilized a co-localized optical mode for laser spectroscopy at millikelvin temperatures.
  • Performed single-photon-level spectroscopy to measure spin relaxation rates.

Main Results:

  • Observed a 10-fold faster spin relaxation when the qubit resonated with a 12 GHz acoustic mode.
  • Demonstrated the acoustic Purcell effect in a solid-state quantum defect.
  • Measured the broadband phonon spectrum of the nanostructure up to 28 GHz using the color center.

Conclusions:

  • Established a new method for controlling quantum defects in solids via acoustic resonators.
  • Paved the way for interconnects between quantum memories and acoustic/superconducting devices.
  • Opened new avenues for quantum information processing and sensing.