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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 one, the...
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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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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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...
1.6K
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...
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Updated: Mar 3, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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88% conversion efficiency with an atomic spin wave mediated mode selection.

Jinxian Guo, L Q Chen, Peiyu Yang

    Optics Letters
    |April 29, 2017
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    Summary
    This summary is machine-generated.

    Researchers improved quantum memory retrieval efficiency using a double-pass Raman scheme with coherent feedback. This method enhances the transfer of atomic spin waves to light, achieving 88% readout efficiency.

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    Area of Science:

    • Quantum optics
    • Atomic physics
    • Quantum information science

    Background:

    • Efficient retrieval of quantum fields from atomic systems is crucial for quantum memory and correlation studies.
    • Converting atomic spin waves to light is a key step, with retrieval efficiency being a critical parameter.

    Purpose of the Study:

    • To enhance the efficiency of transferring atomic spin waves to light fields.
    • To investigate the role of a double-pass Raman scheme with coherent feedback in improving retrieval efficiency.

    Main Methods:

    • Implementation of a double-pass Raman scheme in Rubidium-87 (Rb87).
    • Incorporation of coherent feedback within the double-pass scheme.
    • Generation of atomic spin waves in a high gain regime.

    Main Results:

    • The double-pass scheme significantly enhanced transfer efficiency compared to single-pass schemes.
    • Achieved an 88% readout efficiency for atomic spin waves, limited by decoherence.
    • Demonstrated improved spatial mode selection and atom-light coupling efficiency due to coherent feedback.
    • Observed enhanced correlations between write-in and readout signals.

    Conclusions:

    • The double-pass Raman scheme with coherent feedback effectively improves quantum field retrieval efficiency.
    • This method offers a promising approach for studying continuous variables in quantum systems.
    • The technique is valuable for advancing quantum memory and quantum correlation research.