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Entanglement transmitted Through-Space.

Daniel F E Bajac1,2, Augusto M Lezcano Mendez2, Gustavo A Aucar1,2

  • 1Physics Department, Natural and Exact Science Faculty, Northeastern University of Argentina, Corrientes, Argentina.

Journal of Computational Chemistry
|May 7, 2026
PubMed
Summary

This study reveals through-space (TS) entanglement in molecular systems, linking nuclear spin couplings to electronic excitations. Advanced calculations show this entanglement is sensitive to electron correlation, especially in hydrogen-bonded structures.

Keywords:
computational chemistrymethodssimulationtheory

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Area of Science:

  • Quantum chemistry
  • Theoretical chemistry
  • Spectroscopy

Background:

  • Recent work established entanglement between molecular orbitals (MO) and NMR J-couplings via covalent bonds.
  • This theory describes a novel entanglement involving virtual excitations in molecular states.

Purpose of the Study:

  • To investigate entanglement in through-space (TS) nuclear magnetic resonance (NMR) J-couplings.
  • To explore the relationship between TS J-couplings and entangled excitations.
  • To assess the impact of electron correlation on this phenomenon.

Main Methods:

  • Application of polarization propagator theory.
  • Calculations using Random Phase Approximation (RPA) and Second-Order Polarization Propagator Approximation (SOPPA).
  • Analysis of Phosphorus-Phosphorus, Phosphorus-Carbon, and Nitrogen-Fluorine J-couplings.

Main Results:

  • Entanglement was observed in through-space J-couplings, extending previous findings on covalent pathways.
  • The correlation between TS J-couplings and entangled excitations is sensitive to the level of electron correlation.
  • SOPPA calculations showed significant improvement over RPA, particularly for hydrogen-bonded systems.

Conclusions:

  • Entanglement is a key feature in through-space NMR J-couplings.
  • Accurate calculation of electron correlation is crucial for understanding TS J-couplings.
  • The findings provide new insights into spin-spin coupling mechanisms and molecular interactions.