Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

297
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...
297
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

1.2K
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...
1.2K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
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...
1.2K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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

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

1.2K
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...
1.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Near-unity charge readout signal in a nonlinear resonator without matching the sensor dissipation.

Nature communications·2026
Same author

Buried Unstrained Germanium Channels: A Lattice-Matched Platform for Quantum Technology.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Tunable high-efficiency microwave photon detector based on a double quantum dot coupled to a superconducting high-impedance cavity.

Science advances·2026
Same author

Readout Sweet Spots for Spin Qubits with Strong Spin-Orbit Interaction.

Physical review letters·2026
Same author

Quantifying Strain and Its Effect on Charge Transport in Ge/Si Core/Shell Nanowires.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Radial etching of strongly confined crystal-phase defined quantum dots.

Nanotechnology·2026

Related Experiment Video

Updated: Sep 13, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

5.9K

A dephasing sweet spot with enhanced dipolar coupling.

Jann H Ungerer1,2,3, Alessia Pally2, Stefano Bosco4

  • 1Swiss Nanoscience Institute, University of Basel, Basel, Switzerland.

Communications Physics
|July 28, 2025
PubMed
Summary

Researchers found a "sweet spot" in quantum computing using singlet-triplet transitions in InAs nanowires. This configuration maximizes qubit operation speed and coherence by minimizing dephasing, crucial for advanced quantum technologies.

Keywords:
Electronic devicesElectronic properties and materialsNanowiresQubitsSuperconducting devices

More Related Videos

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.9K
Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

6.3K

Related Experiment Videos

Last Updated: Sep 13, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

5.9K
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.9K
Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

6.3K

Area of Science:

  • Quantum Computing
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Two-level systems (TLSs) are fundamental to quantum computing.
  • A key challenge is the trade-off between operation speed and coherence.
  • This arises from shared coupling paths in qubit architectures.

Purpose of the Study:

  • Investigate a singlet-triplet (ST+) transition as a TLS.
  • Identify a magnetic-field configuration to overcome the speed-coherence trade-off.
  • Mitigate fundamental limitations in quantum bit (qubit) performance.

Main Methods:

  • Implemented TLS in a crystal-phase-defined double-quantum dot in an InAs nanowire.
  • Utilized a superconducting resonator for measurements.
  • Measured spin-orbit interaction (SOI) gap, spin-photon coupling, and TLS dephasing rate versus magnetic-field orientation.

Main Results:

  • Identified a compromise-free sweet spot maximizing dipole coupling and minimizing dephasing.
  • Observed that the sweet spot originates from spin-orbit interaction (SOI).
  • Phonons were identified as the dominant noise source.

Conclusions:

  • The compromise-free sweet spot offers a pathway to enhanced qubit performance.
  • The findings are potentially applicable to any material exhibiting SOI.
  • This research advances nanomaterial engineering for next-generation quantum computing.