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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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.
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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.
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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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Reciprocal or nonreciprocal bimolecular interface and quantum entanglement.

Xing-Chen Wang1,2, Jing-Wei Wang1,2, Lian-Zhen Cao1,2

  • 1Shiyan Key Laboratory of Electromagnetic Induction and Energy Saving Technology, Hubei key laboratory of Energy Storage and Power Battery and Hubei Key Laboratory of Automotive Power Train and Electronic Control, Hubei University of Automotive Technology, Shiyan 442002, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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Summary

This study introduces a hybrid system using a plasmonic cavity for quantum information processing. It achieves strong interactions and quantum entanglement between molecules, advancing quantum technology applications.

Keywords:
bimolecular entanglementhybrid quantum systemnon-reciprocity

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Area of Science:

  • Quantum optics and photonics
  • Molecular quantum mechanics
  • Quantum information science

Background:

  • Plasmonic cavities offer unique light-matter interaction properties.
  • Controlling molecular quantum states is crucial for quantum technologies.
  • Optomechanical systems provide a framework for strong light-matter coupling.

Purpose of the Study:

  • To investigate a hybrid system coupling a plasmonic cavity to molecular vibrations.
  • To explore the potential of this system as a quantum data bus.
  • To engineer steady-state quantum entanglement between molecules.

Main Methods:

  • Coupling a plasmonic cavity to two distinct molecular vibration modes.
  • Utilizing strong optomechanical-like interactions.
  • Employing a dissipative method to achieve continuous variable quantum entanglement.

Main Results:

  • Established a bimolecular interface for reciprocal or non-reciprocal information transmission.
  • Engineered molecules into a steady-state quantum entanglement of the continuous variable.
  • Demonstrated stronger optomechanical-like interactions and enhanced control over molecular quantum units compared to traditional systems.

Conclusions:

  • The hybrid plasmonic-molecular system shows promise for advanced quantum information processing.
  • This approach offers a novel platform for quantum data transmission and entanglement generation.
  • The findings could significantly expand the practical applications of quantum technology.