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Related Concept Videos

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

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

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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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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

948
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,...
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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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Related Experiment Video

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Concurrent Spin Squeezing and Light Squeezing in an Atomic Ensemble.

Shenchao Jin1,2,3, Junlei Duan3, Youwei Zhang3

  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, <a href="https://ror.org/03y3e3s17">Shanxi University</a>, Taiyuan, Shanxi 030006, China.

Physical Review Letters
|November 12, 2024
PubMed
Summary
This summary is machine-generated.

Researchers achieved simultaneous spin squeezing and light squeezing in hot atoms, a dual quantum state useful for quantum metrology and networks. This breakthrough enables new applications in quantum information science.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum information science

Background:

  • Squeezed spin states and squeezed light are crucial for quantum metrology and information science.
  • Previous experiments have studied these quantum states separately, with simultaneous generation posing a significant challenge.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel protocol for the concurrent generation of spin squeezed states and squeezed light.
  • To achieve simultaneous squeezing in a single experimental setup for enhanced quantum applications.

Main Methods:

  • Utilized a novel protocol based on engineered symmetric atom-light interaction in a hot atomic ensemble.
  • Experimentally verified the concurrent generation of both spin squeezing and light squeezing.

Main Results:

  • Achieved concurrent spin squeezing of 0.61±0.09 dB and light squeezing of 0.65_{-0.10}^{+0.11} dB.
  • Demonstrated a deterministic squeezing process with fixed directions for both light and atomic spin.
  • Generated squeezed light in multiple frequency sidebands of a single spatial mode.

Conclusions:

  • Successfully demonstrated the simultaneous generation of dual squeezed states (spin and light) in a hot atomic ensemble.
  • The developed method is applicable for quantum-enhanced metrology and quantum networks.
  • The protocol shows potential for extension to other quantum platforms like optomechanics, cold atoms, and trapped ions.