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Long-distance entanglement in spin systems.

L Campos Venuti1, C Degli Esposti Boschi, M Roncaglia

  • 1Dipartimento di Fisica, Università di Bologna, Viale C. Berti-Pichat 6/2, I-40127 Bologna, Italy.

Physical Review Letters
|August 16, 2006
PubMed
Summary

This study reveals that certain quantum systems, like the spin-1 Heisenberg chain, can maintain entanglement between distant particles. This long-distance entanglement signals a unique quantum transition not found at typical critical points.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum information science

Background:

  • Entanglement typically decays rapidly with distance in quantum systems with short-range interactions.
  • However, some systems exhibit peculiar long-range entanglement properties.

Purpose of the Study:

  • To investigate the phenomenon of long-distance entanglement distribution in quantum systems.
  • To identify conditions and characteristics of systems exhibiting this peculiar entanglement behavior.

Main Methods:

  • Analysis of entanglement properties in realistic models, specifically the spin-1 Heisenberg chain.
  • Examination of entanglement distribution concerning microscopic parameter values.

Main Results:

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  • Sizable entanglement is observed between arbitrarily distant particles in the spin-1 Heisenberg chain model.
  • Long-distance entanglement emerges at parameter values distinct from known quantum critical points.

    • Conclusions:

    • The presence of long-distance entanglement indicates a novel type of quantum transition.
    • This transition is detectable solely through genuine quantum correlations, not standard critical point analysis.