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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.0K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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1.7K
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...
1.7K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.1K
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,...
1.1K

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Room-Temperature Strong Coupling Between a Single Quantum Dot and a Single Plasmonic Nanoparticle.

Jun-Yu Li1, Wei Li1, Jin Liu1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China.

Nano Letters
|May 31, 2022
PubMed
Summary

Researchers achieved strong coupling between quantum dots and plasmonic nanoparticles for room-temperature quantum computing. This breakthrough enables scalable solid-state qubits by enhancing spatial overlap and confinement of electric fields.

Keywords:
Plasmon-exciton strong couplingRabi splittingplasmonic nanoparticlequantum dot

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Area of Science:

  • Quantum Information Science
  • Materials Science
  • Nanotechnology

Background:

  • Strong coupling between quantum dots (QDs) and plasmonic nanoparticles is crucial for scalable solid-state quantum information processing at room temperature.
  • Achieving this strong coupling is challenging due to difficulties in spatially overlapping QD excitons with plasmonic electric fields.

Purpose of the Study:

  • To demonstrate a method for realizing strong coupling between a single QD and a single gold nanorod.
  • To overcome the spatial overlap challenge for enhanced quantum information processing.

Main Methods:

  • Integration of a deterministic single quantum dot with a single gold nanorod using a transmission electron microscope.
  • Construction of a wedge nanogap cavity comprising the QD, nanorod, and substrate.

Main Results:

  • Effective "dragging" and high confinement of plasmonic electric fields within the QD nanoshell were achieved.
  • The largest observed spectral Rabi splitting to date (∼234 meV) for single QD-plasmon strong coupling was reported.
  • Demonstrated a pathway for massive construction of room-temperature strong coupling solid qubits.

Conclusions:

  • The developed method enables effective spatial overlap and field confinement for strong coupling.
  • This work paves the way for scalable, room-temperature solid-state quantum computing using QD-plasmon systems.