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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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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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Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains.

H Schempp1, G Günter1, S Wüster2

  • 1Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany.

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Summary

We studied excitation transport in atomic chains with nonlocal dissipation. Dissipation type controls transport, enabling long-distance hopping and revealing correlations important for Rydberg excitation experiments.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Condensed matter physics

Background:

  • Understanding excitation transport is crucial for quantum technologies.
  • Nonlocal dissipation effects in atomic systems are not fully understood.
  • Rydberg excitation transport experiments require detailed theoretical models.

Purpose of the Study:

  • To investigate excitation transport in atomic chains with nonlocal dissipation.
  • To explore the influence of dissipation on transport dynamics.
  • To analyze correlation and entanglement effects in multi-impurity systems.

Main Methods:

  • Modeling the system using an effective spin-1/2 model.
  • Analyzing the ratio of exchange interaction to reservoir coupling strength.
  • Studying the impact of coupling to short-lived states for nonlocal dissipation.

Main Results:

  • Identified three transport regimes: coherent motion, incoherent hopping, and emergent long-distance hopping.
  • Demonstrated that dissipation creates strong nearest-neighbor correlations and entanglement for multiple impurities.
  • Showcased an emergent length scale governing preferred hopping distances.

Conclusions:

  • Nonlocal dissipation significantly alters excitation transport dynamics.
  • Correlations and many-body effects are vital for understanding Rydberg excitation transport.
  • The developed model provides insights into experimental observations.